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Split Pseudo-Voigt Function

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[quote][i]Originally posted by tayyeeyan[/i]
[br]Origin Version (Select Help-->About Origin): 7.5
Operating System: XP

Hi, I am trying to customize my peak fitting function in the advanced fitting wizard of the non-linear fitting. My code goes like this

if (x<xc)
	
	 y = y0 + (2/(1+ ((n1*2*sqrt(ln(2)/PI)/w1) + (1-n1)*(2*w1/PI))/((n2*2*sqrt(ln(2)/PI)/w2) + (1-n2)*(2*w2/PI))))*(n1*(((2*(sqrt(ln(2)/PI))/w1)*exp((-4*ln(2)*(x-xc)^2)/(w1^2)))) +(1-n1)*(2*w1/PI)*(1/(1+4*(x-xc)^2)));
	
	else
	
	y = y0 + ((2*((n1*2*sqrt(ln(2)/PI)/w1) + (1-n1)*(2*w1/PI))/((n2*2*sqrt(ln(2)/PI)/w2) + (1-n2)*(2*w2/PI)))/(1+((n1*2*sqrt(ln(2)/PI)/w1) + (1-n1)*(2*w1/PI))/((n2*2*sqrt(ln(2)/PI)/w2) + (1-n2)*(2*w2/PI))))*(n2*(((2*(sqrt(ln(2)/PI))/w2)*exp((-4*ln(2)*(x-xc)^2)/w2^2))) +(1-n2)*(2*w2/PI)*(1/(1+4*(x-xc)^2)));

n1, n2, w1, w2, y0 is the variable. 
When i compile, i got an error that says
'Variable "(2*(sqrt(ln(2)/3.1415926535897932384626))/w1)*exp((-4*ln(2)*(x-xc)^2)/(w1^2))" not declared"

may i know what does it means and how can i solve this problem?

Thanks a lot in advance first!

;)

[/quote]

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T O P I C R E V I E W
tayyeeyan	Posted - 04/12/2008 : 07:21:19 AM Origin Version (Select Help-->About Origin): 7.5 Operating System: XP Hi, I am trying to customize my peak fitting function in the advanced fitting wizard of the non-linear fitting. My code goes like this if (x<xc) y = y0 + (2/(1+ ((n12sqrt(ln(2)/PI)/w1) + (1-n1)(2w1/PI))/((n22sqrt(ln(2)/PI)/w2) + (1-n2)(2w2/PI))))(n1(((2(sqrt(ln(2)/PI))/w1)exp((-4ln(2)(x-xc)^2)/(w1^2)))) +(1-n1)(2w1/PI)(1/(1+4(x-xc)^2))); else y = y0 + ((2((n12sqrt(ln(2)/PI)/w1) + (1-n1)(2w1/PI))/((n22sqrt(ln(2)/PI)/w2) + (1-n2)(2w2/PI)))/(1+((n12sqrt(ln(2)/PI)/w1) + (1-n1)(2w1/PI))/((n22sqrt(ln(2)/PI)/w2) + (1-n2)(2w2/PI))))(n2(((2(sqrt(ln(2)/PI))/w2)exp((-4ln(2)(x-xc)^2)/w2^2))) +(1-n2)(2w2/PI)(1/(1+4(x-xc)^2))); n1, n2, w1, w2, y0 is the variable. When i compile, i got an error that says 'Variable "(2(sqrt(ln(2)/3.1415926535897932384626))/w1)exp((-4ln(2)*(x-xc)^2)/(w1^2))" not declared" may i know what does it means and how can i solve this problem? Thanks a lot in advance first! ;)
1 L A T E S T R E P L I E S (Newest First)
larry_lan	Posted - 04/14/2008 : 05:49:10 AM Hi: You'd better define some temporary variables and use short expressions in your function, such as: double temp1 = sqrt(ln(2)/PI)/w1; double temp2 = 4pow( (x-xc), 2 ); if(xc<0) { y = temp1 + temp2; } else { y = temp1 temp2; } Or, it's very easy to make mistakes. Thanks Larry OriginLab Technical Services Edited by - larry_lan on 04/14/2008 05:59:00 AM

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