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Generate Same Sequence of Random Numbers in IDL and C [message #89061]

Mon, 21 July 2014 09:11

sweiss1993
Messages: 4
Registered: July 2014

Junior Member

I am in the process of developing a C version of a program originally written in IDL. The programs generate arrays with random number generators. I use gsl_rng_uniform and gsl_ran_poisson in the C version, and both random number generators use the gsl_rng_mt19937 algorithm. From attempting to read GDL's source code, I noticed GDL happens to use the same functions.

I would like to compare the two versions of the program by running them with the same fixed sequence of random numbers. The rng parts of the programs are in a loop, so a new array is generated with each iteration. I would like a different set of random numbers for each iteration. So, each iteration has a different set of generated numbers, but the i-th iteration in the programs should match each other.

I could not figure out exactly how GDL sets the seed by reading the source code. Would someone be so kind as to show me how to seed the rng functions in IDL and C such that the above conditions are met? Thanks!

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[Message index]

		Generate Same Sequence of Random Numbers in IDL and C By: sweiss1993 on Mon, 21 July 2014 09:11
		Re: Generate Same Sequence of Random Numbers in IDL and C By: Michael Galloy on Mon, 21 July 2014 10:16
		Re: Generate Same Sequence of Random Numbers in IDL and C By: sweiss1993 on Tue, 22 July 2014 09:21
		Re: Generate Same Sequence of Random Numbers in IDL and C By: Michael Galloy on Tue, 22 July 2014 11:07
		Re: Generate Same Sequence of Random Numbers in IDL and C By: Michael Galloy on Tue, 22 July 2014 14:13
		Re: Generate Same Sequence of Random Numbers in IDL and C By: sweiss1993 on Wed, 23 July 2014 09:52
		Re: Generate Same Sequence of Random Numbers in IDL and C By: Michael Galloy on Wed, 23 July 2014 11:03
		Re: Generate Same Sequence of Random Numbers in IDL and C By: sweiss1993 on Wed, 23 July 2014 16:42
		Re: Generate Same Sequence of Random Numbers in IDL and C By: Michael Galloy on Thu, 24 July 2014 10:34

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