[Freeswitch-users] Random number generation

Chris Young Chris.Young at enghouse.com
Thu Jan 26 11:11:35 MSK 2017 

Superb, thank you very much, it is now working as expected.


From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: 25 January 2017 18:47
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] Random number generation

On further review, this has been a bug in the expr library used in that module since the beginning.

Fixed in master and 1.6 branch
https://freeswitch.org/jira/browse/FS-9978


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On Wed, Jan 25, 2017 at 2:32 AM, Chris Young <Chris.Young at enghouse.com<mailto:Chris.Young at enghouse.com>> wrote:
Hi Anthony,

Yes, it's a VM but I also tried it on a physical machine and got the same behaviour. I am running on Windows so perhaps that's the issue (although I'm not sure why it should be). Unfortunately, because of that I don't think the services you mentioned will be applicable.

I also tried the command direct from the FreeSWITCH console (sorry, I forgot to mention that in my previous post) but saw the same results.

Thanks,
Chris

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>] On Behalf Of Anthony Minessale
Sent: 24 January 2017 20:52

To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Random number generation

Is it a VM? Maybe you have no entropy, can also prevent startup sometimes.

Try installing rng-tools
If the service doesn't start you have to edit /etc/init.d/rng-tools and change the device to /dev/urandom

then

systemctl daemon-reload

systemctl start rng-tools.service



you can test it without making calls by just running this at the cli

expr randomize(&x);ceil(random(0,100,&x))





On Tue, Jan 24, 2017 at 2:30 PM, Srigo Kana <ksrigo at gmail.com<mailto:ksrigo at gmail.com>> wrote:
We are running on Debian Jessie.

Srigo

On 24 Jan 2017, at 14:36, Chris Young <Chris.Young at enghouse.com<mailto:Chris.Young at enghouse.com>> wrote:
It's very strange. Anyway, thank you for trying and for confirming my dialplan.

Out of interest, which platform are you running FreeSWITCH on?

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of KSrigo
Sent: 24 January 2017 13:26
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Random number generation

Then I have no idea why it’s not working for you. I even tried your dialplan its working fine:

Dialplan:

<!--TEST START-->

<extension name="call_duration" continue="true">
        <condition field="destination_number" expression="^call_duration$" break="never">
                <action application="set" data="call_length=${expr(randomize(&x);ceil(random(29999,45000,&x)))}" inline="true"/>
                <action application="log" data="INFO Random value is ${call_length}"/>
        </condition>
</extension>

<extension name="transfer_request">
        <condition field="destination_number" expression="^\*(85)$">
                <action application="pre_answer"/>
                <action application="answer"/>
                <action application="execute_extension" data="call_duration XML from-core"/>
                <action application="log" data="INFO Call from ${caller_id_number} to ${destination_number} will last for ${call_length}ms"/>
                <action application="execute_extension" data="call_duration XML from-core"/>
                <action application="log" data="INFO Call from ${caller_id_number} to ${destination_number} will last for ${call_length}ms"/>
                <action application="sleep" data="${call_length}"/>
                <action application="hangup" data="NORMAL_CLEARING"/>
        </condition>
</extension>

<!--TEST END-->


Output:

2017-01-24 13:22:23.616006 [INFO] mod_dialplan_xml.c:637 Processing 33170567631 <33170567631>->call_duration in context from-core
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->unloop] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [unloop] ${unroll_loops}(true) =~ /^true$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [unloop] ${sip_looped_call}() =~ /^true$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->outside_call] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Absolute Condition [outside_call]
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(outside_call=true)
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action export(RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->call_duration] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [call_duration] destination_number(call_duration) =~ /^call_duration$/ break=never
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(call_length=${expr(randomize(&x);ceil(random(29999,45000,&x)))}) INLINE
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(call_length=35719)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [call_length]=[35719]
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action log(INFO Random value is ${call_length})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->transfer_request] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [transfer_request] destination_number(call_duration) =~ /^\*(85)$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->call_debug] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [call_debug] ${call_debug}(false) =~ /^true$/ break=never
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->homer_X_cid] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [homer_X_cid] destination_number(call_duration) =~ /.*/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(sip_h_X-CID=${sip_call_id})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->Local_Extension] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [Local_Extension] destination_number(call_duration) =~ /^\*(85)$/ break=on-false
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute set(outside_call=true)
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(outside_call=true)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [outside_call]=[true]
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute export(RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> export(RFC2822_DATE=Tue, 24 Jan 2017 13:22:23 +0000)
2017-01-24 13:22:23.616006 [DEBUG] switch_channel.c:1296 EXPORT (export_vars) [RFC2822_DATE]=[Tue, 24 Jan 2017 13:22:23 +0000]
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute log(INFO Random value is ${call_length})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> log(INFO Random value is 35719)
2017-01-24 13:22:23.616006 [INFO] mod_dptools.c:1713 Random value is 35719
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute set(sip_h_X-CID=${sip_call_id})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(sip_h_X-CID=313438353236343134333135383733-7sj1k4kl0i83)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [sip_h_X-CID]=[313438353236343134333135383733-7sj1k4kl0i83]
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> log(INFO Call from 33170567631 to *85 will last for 35719ms)
2017-01-24 13:22:23.616006 [INFO] mod_dptools.c:1713 Call from 33170567631 to *85 will last for 35719ms
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> execute_extension(call_duration XML from-core)
2017-01-24 13:22:23.616006 [INFO] mod_dialplan_xml.c:637 Processing 33170567631 <33170567631>->call_duration in context from-core
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->unloop] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [unloop] ${unroll_loops}(true) =~ /^true$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [unloop] ${sip_looped_call}() =~ /^true$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->outside_call] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Absolute Condition [outside_call]
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(outside_call=true)
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action export(RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->call_duration] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [call_duration] destination_number(call_duration) =~ /^call_duration$/ break=never
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(call_length=${expr(randomize(&x);ceil(random(29999,45000,&x)))}) INLINE
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(call_length=33576)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [call_length]=[33576]
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action log(INFO Random value is ${call_length})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->transfer_request] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [transfer_request] destination_number(call_duration) =~ /^\*(85)$/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->call_debug] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [call_debug] ${call_debug}(false) =~ /^true$/ break=never
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->homer_X_cid] continue=true
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (PASS) [homer_X_cid] destination_number(call_duration) =~ /.*/ break=on-false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Action set(sip_h_X-CID=${sip_call_id})
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> parsing [from-core->Local_Extension] continue=false
Dialplan: sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> Regex (FAIL) [Local_Extension] destination_number(call_duration) =~ /^\*(85)$/ break=on-false
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute set(outside_call=true)
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(outside_call=true)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [outside_call]=[true]
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute export(RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> export(RFC2822_DATE=Tue, 24 Jan 2017 13:22:23 +0000)
2017-01-24 13:22:23.616006 [DEBUG] switch_channel.c:1296 EXPORT (export_vars) [RFC2822_DATE]=[Tue, 24 Jan 2017 13:22:23 +0000]
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute log(INFO Random value is ${call_length})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> log(INFO Random value is 33576)
2017-01-24 13:22:23.616006 [INFO] mod_dptools.c:1713 Random value is 33576
2017-01-24 13:22:23.616006 [NOTICE] switch_core_session.c:2895 Execute set(sip_h_X-CID=${sip_call_id})
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> set(sip_h_X-CID=313438353236343134333135383733-7sj1k4kl0i83)
2017-01-24 13:22:23.616006 [DEBUG] mod_dptools.c:1519 SET sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> [sip_h_X-CID]=[313438353236343134333135383733-7sj1k4kl0i83]
EXECUTE sofia/core/33170567631 at sip.v.ibrowse.com<mailto:sofia/core/33170567631 at sip.v.ibrowse.com> log(INFO Call from 33170567631 to *85 will last for 33576ms)
2017-01-24 13:22:23.616006 [INFO] mod_dptools.c:1713 Call from 33170567631 to *85 will last for 33576ms


regards,
srigo


On Jan 24, 2017, at 2:00 PM, Chris Young <Chris.Young at enghouse.com<mailto:Chris.Young at enghouse.com>> wrote:

I was running an older version of FreeSWITCH (1.5.15) but I've just retried with 1.6.14 and I still get the same behaviour. I am running on Windows in case that makes any difference.

Here is my dialplan. This server is part of a test environment and what I am trying to achieve is to have a variable call duration:

<?xml version="1.0" encoding="utf-8"?>
<include>
                <extension name="persistent_agent_leg">
<condition field="destination_number" expression="^([78]\d{3})$">
<action application="set" data="send_silence_when_idle=400"/>
<action application="pre_answer"/>
                                                <action application="answer"/>
                               <action application="park"/>
                                </condition>
                </extension>

                <extension name="call_duration" continue="true">
                                <condition field="destination_number" expression="^call_duration$" break="never">
                                                <action application="set" data="call_length=${expr(randomize(&x);ceil(random(29999,45000,&x)))}" inline="true"/>
                                </condition>
                </extension>

                <extension name="transfer_request">
                                <condition field="destination_number" expression="^([45]\d{3})$">
                                                <action application="pre_answer"/>
                                                <action application="answer"/>
                                                <action application="execute_extension" data="call_duration XML default"/>
                                                <action application="log" data="INFO Call from ${caller_id_number} to ${destination_number} will last for ${call_length}ms"/>
                                                <action application="sleep" data="${call_length}"/>
                                                <action application="hangup" data="NORMAL_CLEARING"/>
                                </condition>
                </extension>
</include>


From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of KSrigo
Sent: 24 January 2017 10:37
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Random number generation

Yes “from-core" was my context for the test. You have to update according your config. Could you tell me your freeswitch version?
Mine is: FreeSWITCH Version 1.6.8-15-99de0ad~64bit. The config I gave you works fine on it.

Could you post your dialplan ?

Here is the whole dial plan I used for the test:

<include>
  <context name="from-core">
    <extension name="random_number_gen" continue="true">
      <condition field="destination_number" expression="^random_number_gen$" break="never">
        <!-- generate random number between 1 and 100 -->
        <action application="set" data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}" inline="true"/>
        <action application="log" data="INFO Random value is ${rand_val}"/>
      </condition>
    </extension>

    <extension name="Local_Extension">
      <condition field="destination_number" expression="^\*(85)$">
        <!--test 1-->
        <action application="execute_extension" data="random_number_gen XML from-core"/>
        <!--test 2-->
        <action application="execute_extension" data="random_number_gen XML from-core"/>
        <action application="hangup"/>
      </condition>
    </extension>
  </context>
<include>

Regards,
Srigo

On Jan 24, 2017, at 10:52 AM, Chris Young <Chris.Young at enghouse.com<mailto:Chris.Young at enghouse.com>> wrote:

Hi Srigo,

Thanks for your help. Unfortunately, I still see the same value getting generated each time the extension gets executed e.g.

                51a7a226-27e6-4fe3-979b-0b0bb28253d9 2017-01-24 09:49:21.504783 [INFO] mod_dptools.c:1628 Random value is 1
70aae2dc-cee6-4a3c-805f-5655abd7e6e6 2017-01-24 09:49:21.965642 [INFO] mod_dptools.c:1628 Random value is 1
92e81c00-0ff0-4ddc-819f-019c145f39be 2017-01-24 09:49:22.444287 [INFO] mod_dptools.c:1628 Random value is 1

I take it that from-core is some context you've defined in your environment rather than anything special, as it didn't work when I used that (so I changed it to 'default')?

Regards,
Chris


From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of KSrigo
Sent: 24 January 2017 09:14
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Random number generation

Hi Chris,

I’m not sure if I understood exactly your needs. This is how I use randomize function:

Define Random Number Generator extension:

<extension name="random_number_gen" continue="true">
  <condition field="destination_number" expression="^random_number_gen$" break="never">
    <!-- generate random number between 1 and 100 -->
    <action application="set" data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}" inline="true"/>
    <action application="log" data="INFO Random value is ${rand_val}"/>
  </condition>
</extension>


then call it in your diaplan each time you need to get a random number set:

<action application="execute_extension" data="random_number_gen XML from-core"/>


Regards,
Srigo


On Jan 24, 2017, at 9:51 AM, Chris Young <Chris.Young at enghouse.com<mailto:Chris.Young at enghouse.com>> wrote:

Hello all,

On the wiki, there is an example of using mod_expr to generate a random number:

                <!-- generate random number between 1 and 100 -->
                <action application="set" data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}"/>
                <action application="log" data="INFO Random value is ${rand_val}"/>

This works well the first time but if the same dialplan instructions are executed subsequently, the same number is produced each time.

Is this by design? Is there any other way to seed the random number generator so it will produce different results, as randomize() doesn't seem to be doing quite what I thought it would?

Many thanks,
Chris

Chris Young
Software Engineer
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