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Re: Calculating the Exponential using IDL [message #70175]

Tue, 23 March 2010 15:38

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Mar 23, 7:11 pm, IDL beginner <moxam...@gmail.com> wrote:
> In IDL EXP(-700) = 0, while in MATLAB the answer is EXP(-700) =
> 9.8597e-305. I need IDL to give me the same answer as MATLAB but I do
> not know what to do.

Stop giving exp() an integer:

IDL> print,exp(-7d2)
9.8596765e-305

Though you are close to the double precision limit for underflow. I
found it to be between -745d0 and -746d0.

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Re: Calculating the Exponential using IDL

By: penteado on Tue, 23 March 2010 15:38

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