| Author |
 Topic  |
|
|
Martta
Finland
3 Posts |
 Posted - 04/09/2013 : 04:43:57 AM
|
Hello all,
I'm working with Origin 8.6 and trying to finish my Master's thesis. I am trying to build equation with Origin C but I can't get it right. Here's the equation:
if ( x < Topt )
y=Iopt*exp*(-2,3*(x-Topt)^2/(Tinf-Topt));
else if ( x > Topt )
y=Iopt*exp*(-2,3*(x-Topt)^2/(Tsup-Topt));
When I go to Code Builder, I get the message "Compile error". This is what happens in the Code builder:
//----------------------------------------------------------
//
void _nlsfLehmann(
// Fit Parameter(s):
double Iopt, double Topt, double Tsup, double Tinf,
// Independent Variable(s):
double x,
// Dependent Variable(s):
double& y)
{
// Beginning of editable part
if ( x < Topt )
y=Iopt*exp*(-2,3*(x-Topt)^2/(Tinf-Topt));
else if ( x > Topt )
y=Iopt*exp*(-2,3*(x-Topt)^2/(Tsup-Topt));
// End of editable part
}
I would really appreciate your help.
Thank you,
Martta |
|
|
malgoska
Poland
36 Posts |
Posted - 04/09/2013 : 05:09:07 AM
|
Hi,
there are few issues with your function:
1. the if-else statements has syntax
if(condition1) statement1;
else statement2;
so you don't need another if
2. use dots instead of commas as decimal mark
3. no need for asterisk after exponent.
Your function should look like this:
// Beginning of editable part
if ( x < Topt ) y=Iopt*exp(-2.3*(x-Topt)^2/(Tinf-Topt));
else y=Iopt*exp(-2.3*(x-Topt)^2/(Tsup-Topt));
// End of editable part
Regards,
Margaret |
 |
|
|
Martta
Finland
3 Posts |
Posted - 04/09/2013 : 06:53:34 AM
|
Thank you so very much, it's working now!
Best regards,
Martta |
|
|
| |
Topic |
|
|
|
Failed to build equation with Origin C