use for loop to call the function 600 times

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william Smith 2019-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448199-use-for-loop-to-call-the-function-600-times

编辑： Stephen23 2019-3-5

function[v_a, x_direction, y_direction, v_b, t_flight]=func(friction, initalelevation)
friction= 0.1
initial elevation= 100

looking to run the function 600 times using for loop

Please help!

Thanks!

回答（1 个）

Kevin Phung 2019-3-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448199-use-for-loop-to-call-the-function-600-times#answer_363783

在 MATLAB Online 中打开

friction= 0.1 : 0.05 : 0.65
initial_elevation= 100 : 15 : 200 
rows = numel(friction);
col = numel(initial_elevation);
v_a = zeros(rows,col);
x_direction = zeros(rows,col);
y_direction = zeros(rows,col);
v_b = zeros(rows,col);
t_flight = zeros(rows,col);
for i = 1:numel(friction)
    for j = 1:numel(initial_elevation)
        [v_a(i,j), x_direction(i,j), y_direction(i,j), v_b(i,j), t_flight(i,j)] = func(friction(i), initial_elevation(j))
    end
end

let me know if this is what you wanted. each parameter will be a matrix where each row is a calculation done with a different friction, and each column represents a different elevation.

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william Smith 2019-3-5

just to make sure no confusion there I changed the "i" you sent in the code to something else

Thanks again!

Stephen23 2019-3-5

编辑：Stephen23 2019-3-5

在 MATLAB Online 中打开

You need to read the documentation for every operator that you use, no matter how trivial you think it is. For example, this line

while x_direction(i)==0:500 && y_direction(i)==0:-134

is unlikely to do what you probably want (I guess you want to iterate over those values). The while documentation states "An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false", and the == eq operator performs an element-wise equivalence of your scalar value x_direction(i) with the vector 0:500, which means that your while loop will never run (at most one element returned by == will be true, so the condition will never be fulfilled).

And the && should throw an error with those non-scalar inputs anyway...

Read the documentation. Test each line until you are certain that is does exactly what you need.

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