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verrallr@a

Canada
44 Posts
Posted - 06/05/2008 :  2:32:10 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version v7.5885 (B885)
Operating System:

I am trying to program Density into OriginC.

My OriginC program is :
#include <Origin.h>

double Density(double T)
{return (4956.4/(1.0+3.0*10E-6*(-0.78155+0.1177*T-3.0254E-6*T*T)*
(T-298.)));}

In my script window, I get this for 400 degrees:

bc=Density(400);
bc=;
BC=0.3535184

However this is wrong.

When I give the formula in the Script window for 400 degrees, I get this:

dd=(4956.4/(1.0+3.0*10E-6*(-0.78155+0.1177*400-3.0254E-6*400*400)*(400-298.)));
dd=;
DD=4346.987

That is right.

Why won't my Density give me the correct result in the OriginC program.

Thank you for your assistance.

rlewis

Canada
253 Posts
Posted - 06/06/2008 :  02:02:36 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I compiled and ran the Density function under OriginPro 7.5-SR6 and it gave the correct answer ...
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verrallr@a

Canada
44 Posts
Posted - 06/06/2008 :  1:32:25 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I exited Origin 7.5 (non-Pro) and then logged back in to see if that would help. It didn't.

However, I've figured out a new way to get the density.

Richard.
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