Help with nesting subfunctions?
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I have an assignment that requires me to use a nested subfunction to produce a plot, and am not sure how to incorporate it. The exact problem states:
Recall Euler’s formula from analytical calculus: ei·x = cos(x) + i · sin(x), where i is the imaginary unit. A slight rearrangement yields:
cos(x) = ei·x − i · sin(x)
Create a nested subfunction that accepts one input argument x (which may be
a vector) and returns the cos function defined as above. Call this function and plot its output from −π ≤ x ≤ π using π/100 increments. Label axes and title it ”Euler Output”.
So far, I have not even been able to do this without a nested subfunction. MATLAB tells me that, "Subscript indices must either be real positive integers or logicals," but the given equation clearly needs to make use of imaginary roots.
3 个评论
Robert Cumming
2012-9-25
post some of your code to show us what you have done.
Tyler
2012-9-25
Tyler
2012-9-25
采纳的回答
Wayne King
2012-9-25
编辑：Wayne King
2012-9-25
Your problem is here:
cos(x)=exp(1i.*x)-1i*sin(x);
You should spend some time reading the MATLAB Getting Started material, but you just assign the output to a variable.
cosx = exp(1i*x)-1i*sin(x);
Of course you have another problem with figure1( ) unless you have written a function called figure1().
2 个评论
Tyler
2012-9-25
Wayne King
2012-9-25
cosx =@(x) exp(1i*x)-1i*sin(x);
that gives you a function handle.
Then you can do:
x = -pi:0.01:pi;
y = cosx(x);
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