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DarkBASIC Discussion / Random Numbers

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BadMonkey91
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Posted: 3rd Jun 2004 22:40 Edited at: 3rd Jun 2004 22:54
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This is wierd, but when I use the rnd() command to generate random numbers, it works fine within the DBC editing tool.

But if I build an executable file, it does not work properly.

It generates "Random" numbers, but in a sequential order, resulting in the same numbers being generated every time the program is opened.

Is there a patch, or some help? Has anyone every encountered this before?

[edit]I looked through some other threads, and found someone saying something like seeding your random numbers, can you do that in DB?

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Oibaf2000
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Posted: 3rd Jun 2004 23:09
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From a post I had startedDreamKeeper's response)


So if you want a REAL random you have to use this:





You must use randomize timer() because you will seed the Random generator with "Timer()" and because Timer() never is the same, you will get REAL random . Then you must throw away the first 100 random's because they aren't really random.

Hope this helps
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Hamish McHaggis
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Posted: 3rd Jun 2004 23:13
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First 100 aren't random? What are you talking about? Rnd() can never be truely random, even if you use randomize timer(), timer() is a regular and eventually repeating pattern, therefore if you run your program twice, at the same processor time, you will get the same results. As for the first 100 being not random, I've never heard that one before .

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BadMonkey91
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Posted: 3rd Jun 2004 23:18
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yeah, I thought I'd have to create a timer within my program.
Sort of a pain in the @$$.

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BatVink
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Posted: 4th Jun 2004 15:04
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Throwing away the first 100 does nothing.

Randomize picks a seed. That is, a starting point. It then continues sequentially again. Missing 100 acheives nothing more than adding 100 to your original seed.

To generate a more random sequence, you need to use randomize several times in your program, preferably at unpredictable points.

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Hamish McHaggis
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Posted: 4th Jun 2004 16:43
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BadMonkey - Create a timer? The timer() command is already there for you. It returns the processor time in milliseconds. Just stick the line RANDOMIZE TIMER() at the top of your program.

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Powersoft
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Posted: 6th Jun 2004 13:32
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get the time and use that

Im not a rubbish programmer...Everyone else is just better than me....
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Chris K
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Posted: 6th Jun 2004 17:47
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Just add a load of random things (FPS / mousex() etc.) together.
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