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Cannot identify error in line of code
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Stenila Simon
el 17 de Sept. de 2017
Comentada: Stenila Simon
el 17 de Sept. de 2017
Hi everyone,
I'm trying to figure out why this line of code is ending up in error whenever I run the code. Is there something small I'm missing maybe? The error is in line 10 by the way.
Thank you!
EDIT: This is the error message:
">> Cnvalues
Index exceeds matrix dimensions.
Error in Cnvalues (line 15)
Cn12 = ((-CpAOA12(i+1)-CpAOA12(i))./2).*((xvec(i+1))-(xvec(i)));"
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/167236/image.png)
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Stephen23
el 17 de Sept. de 2017
@Stenila Simon: please edit your question and do both of these things:
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Jan
el 17 de Sept. de 2017
Editada: Jan
el 17 de Sept. de 2017
You reset sumCn4 in each iteration to 0 and add Cn4. In consequence the result will contain the last element only - if the code does not stop with an error.
The error message tells you, what the problem is. It is required that you show us the message if you want us to help you. We cannot read your mind :-)
I guess, that either CpA0A4 or xvec does not contain 55 elements, such that the index i+1 must fail.
A nicer and faster solution without a loop:
sumCn4 = -2 * sum((CpA0A4(2:end) + CpA0A4(1:end-1)) ./ diff(xvec))
if CpA0A4 and xvec have the same size.
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Walter Roberson
el 17 de Sept. de 2017
Your initialization of sumCn4 should be before the loop.
Your maximum value for i should be at most min( length(cpAOA4) - 1, xvec - 1) so if those are length 54 then you should have "for i = 1 : 53"
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