MATLAB: Calculations using Inline Functions

inline()matlab function

Hello… I'm still a beginner when it comes to using MATLAB and I can't seem to figure this equation out.
My Code:
t = (-100:0.01:100);
g = inline ('(exp(-t).*(cos(2*pi*t))).*(t>=0)','t');
h = inline ('g((2*t)+1) + g(1-t)','t','g');
E = inline('((g(2*t+1) + g(1-t)).^2)','t','g'); % square of the function h(t)
En = quad(E(h,t),-100,100);
En (E,t)
Error:
Error using inlineeval (line 14)
Error in inline expression ==> ((g(2*t+1) + g(1-t)).^2)
 Undefined function 'mtimes' for input arguments of type
 'inline'.
Error in inline/subsref (line 23)
    INLINE_OUT_ = inlineeval(INLINE_INPUTS_,
    INLINE_OBJ_.inputExpr, INLINE_OBJ_.expr);
Error in BA2 (line 27)
En = quad(E(h,t),-100,100);
Please and thank you.

Best Answer

I've never used 'inline' and didn't even know it existed, but the documentation says:
'inline will be removed in a future release. Use Anonymous Functions instead.'
so I would suggest not using inline if you intend to keep your code for future usage too. I use anonymous functions a lot which is probably why I never knew about the 'inline' function.
It looks like you have too many closing parenthesis in your definition of 'g' though.
Try using the following instead as an anonymous function:
g = @(t) exp(-t) .* cos( 2 * pi * t ) .* ( t >= 0 );
h = @(t) g(( 2 * t ) + 1 ) + g( 1 - t )
E = @(t) h(t).^2
I think that should work for E...no need to define it in terms of g if it is just h squared.
Then I assume this should give the right answer:
En = quad( E, -100, 100 );
Again though the 'quad' function says it will be removed in a future release, but maybe if you are using an old Matlab you don't have the suggested replacement function.
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