how do i write this equation in live script

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mark@4882
mark@4882 2020-1-21
编辑： Image Analyst 2020-1-22
Create a function handle called f which takes a single input variable and performs the following calculation.
f(θ) = sin3(θ) 2 + cos(θ) sin(2θ)
The function should be “vectorized” with element-wise operators, where appropriate, so that it can take single numbers as input or matrices as input.

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回答（1 个）

Image Analyst
Image Analyst 2020-1-21
What does sin3(θ) 2 mean? Tell us in words because there is no sin3() function.
Try
theta = linspace(-pi, pi, 1000);
f = sin(theta).^3 + cos(theta) .* sin(2*theta);
Adapt as needed after you figure out what that weird equation means.
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mark@4882
mark@4882 2020-1-22
f('\theta') = @('\theta) (sin('/theta').^3)./(2 + cos('/theta') sin(2.*'\theta'))
I'm still getting an error
Walter Roberson
Walter Roberson 2020-1-22
编辑：Image Analyst 2020-1-22
You cannot use \theta or '\theta' as the name of a variable.
f = @(theta) (sin(theta).^3)./(2 + cos(theta) .* sin(2.*theta))
However you appear to have forgotten that MATLAB does not have any implicit multiplication. If you want to multiply two values you must use either the * or .* operation. The * operation is for algebraic matrix multiplication ("inner product") and the .* operation is for element-by-element multiplication.

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