numerical integration dimension error

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john birt
john birt on 2 Mar 2011
ok now Im getting another type of error
X = 0:1:100; Y = X.^(-1/2)*exp(-0.5*(0.00009996^2/X+34.3713^2*X)); Z =trapz(X,Y)
??? Error using ==> mldivide
Matrix dimensions must agree.
Whats wrong here? and how can I numerically integrate Y?

Accepted Answer

Matt Fig
Matt Fig on 2 Mar 2011
You need a dot before every ^, * and / when working with vectors.
Y = X.^(-1/2).*exp(-0.5*(0.00009996^2./X+34.3713^2*X));
john birt
john birt on 2 Mar 2011
Thanks for your wisdom, I can get an answer if I change it to something like
X = 0.001:0.001:0.003; Y = X.^(-1/2).*exp(-0.5*(0.00009996^2./X+34.3713^2*X)); Z = trapz(X,Y)
Z = 0.0172
thanks again for your comments (dumb matlab coders like me need help!)

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