How to vectorize this function?

Question

Quinten Lodewijks 2017-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/330441-how-to-vectorize-this-function

编辑： Quinten Lodewijks 2019-7-9

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Hello,

i'm new to matlab so this could have a really easy solution but a google search didn't solve my question.

this is the function:

function [angle]= give_angle(position)
if position <= -2 && position > -4
    angle = 11.31;
else
    angle = 0;
end
end

now if "position" would be a vector lets say: position = -2:0.1:2 it gives the error: Operands to the and && operators must be convertible to logical scalar values.

I tried to replace && with & but then this error comes up: Output argument "angle" (and maybe others) not assigned during call to "give_angle".

All help will be appreciated!

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Answer 1

David Goodmanson 2017-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/330441-how-to-vectorize-this-function#answer_259251

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Hello Quinten, a standard way to do this is to make a vector of zeros the same length as 'position', then make a logical index vector of 1's and 0's for whether the condition is met or not, then change the angle when the condition is met.

angle = zeros(size(position));          % automatically satisfies 'not met' condition             
ind = position <= -2 & position > -4;
angle(ind) = 11.31;