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 fitting gaus peak with exponential tail		  New Topic  Reply to Topic
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moritzpascal

Germany
1 Posts
Posted - 05/10/2013 :  10:39:52 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): Origin 8.5 SR0
Operating System: XP

Hallo,
I am trying to fit alpha spectra with origin. therefore I need a fit function which describes an gaus peak with an left sided exponential tail.

my function looks like:
y=A/2 (((1-n)/t1)*exp((x-u1)/t1 + sig^2/(2*t1^2))*erfc(1/sqrt(2)*((x-u1)/sig+sig/t1))
+ n/t2*exp((x-u1)/t2 + sig^2/(2*t2^2))*erfc(1/sqrt(2)*((x-u1)/sig+ sig/t2));

when trying to compile the function I get the error
:Error, mismatching usage of parentheses

Is this a problem of how i use the erfc??

Sam Fang

291 Posts
Posted - 05/13/2013 :  02:31:43 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
There are two errors in the code:
1. 
y=A/2*

2. A right parentheses is missing at the end of the code.

The correct code should be:
y =A/2* ( ((1-n)/t1)*exp( (x-u1)/t1 + sig^2/(2*t1^2) )*erfc( 1/sqrt(2)*((x-u1)/sig+sig/t1) )+ n/t2*exp( (x-u1)/t2 + sig^2/(2*t2^2) )*erfc( 1/sqrt(2)*((x-u1)/sig+ sig/t2) ) );


You can use Brace Matching tool in Code Builder dialog to check parentheses matching for the function definition code.

Sam
OriginLab Technical Services
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