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plotting functions in matlab

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payam abubakr
payam abubakr 2020-5-11
编辑： Stephen23 2020-5-12
Hello, can you help with this question, please?
I want to plot a function of y(theta) = sin(theta) , but matlab gives me error i don't know why.
I have tried this so far,
function [y] = myfunction(/theta)
y = sin(/theta)
end

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Stephen23
Stephen23 2020-5-11
function [y] = myfunction(theta) % "/" is not valid in a variable name
y = sin(theta);
end
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Stephen23
Stephen23 2020-5-11
编辑：Stephen23 2020-5-12
Like most programming languages, MATLAB does not have implicit multiplication of two things written next to each other: if two things are multiplied together, you need to write some multiplication operator between them.
This means your code is invalid because it is missing a multiplication operator:
cos(2 theta)?
% ^ missing!
Try this:
cos(2*theta)
"it does not allow me to plot it even with this code"
You need to learn about array and matrix operations:
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
y = sin(theta).*cos(2*theta);
% ^^ element-wise times
payam abubakr
payam abubakr 2020-5-11
thank you! it helped me a lot.

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