Numeric Derivative - problem entering df

Hi,

I have a function (e(1)^(cos(x^2))+ln(1+x^2)...I derived it correctly to (2*x/1+x^2)-2*x*sin(x^2)*(e(1)^cos(x^2))

Then I tried to enter it to Matlab in this form:

 df=(2*x./(1+x.^2))-(2*x.*sin(x.^2)*exp(1)^(cos(x.^2)))

But I am still having this error: Error using ==> mpower Inputs must be a scalar and a square matrix. To compute elementwise POWER, use POWER (.^) instead.

I really don't know where else I have to put the dots...

Can somebody fix this expression, please ??

Thanks a lot

Answer 1

[Azzi Abdelmalek]

df=2*x./(1+x.^2)-2*x.*sin(x.^2).*exp(1).^cos(x.^2)

[Jiri]

Thanks a lot, it helped :)

Answer 2

[Roger Stafford]

Matlab is complaining about the "*" operator just after "sin(x.^2)". It should be ".*". Also you should be using matlab's 'exp' function:

 df=(2*x./(1+x.^2))-(2*x.*sin(x.^2).*exp(cos(x.^2));

[Jiri]

I am using Euler number