Using an index in a loop as a variable in another function

Question

Oskar Mevik Päts 2019-11-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/493457-using-an-index-in-a-loop-as-a-variable-in-another-function

评论： Oskar Mevik Päts 2019-11-27

function alpha = uppp2(x)
N = 100; d = 75; g = 5; h = 0.1;
for n = 1:x
alpha(1,n) = (x+1-n) * d;
end
for n = 1:N
alpha((n+1),1) = alpha(n,1) + g * h;
end
for j = 2:x
for n = 1:N % index n
alpha(n+1,j) = alpha(n,j) + h * vel((alpha(n,j-1)) - alpha(n,j))
end
end
end
function kappa = vel(y)
kappa(y >= d) = n * h * 25 / 6 % Here i want to use the same index n as in the foor loop
kappa(y == d) = 25
kappa(y <= d) = g - 1
end
% How do I achive this? It seems like the function Kappa doesn't find the variable n.

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Answer 1

Johannes Fischer 2019-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/493457-using-an-index-in-a-loop-as-a-variable-in-another-function#answer_403590

编辑：Johannes Fischer 2019-11-27

在 MATLAB Online 中打开

You need to provide it as an additional argument (the same holds for d, g, and h):

...
    alpha(n+1,j) = alpha(n,j) + h * vel(n, d, g, h, (alpha(n,j-1)) - alpha(n,j))
...
function kappa = vel(n, d, g, h, y)
    kappa(y >= d) = n * h * 25 / 6 % Here i want to use the same index n as in the foor loop
    kappa(y == d) = 25
    kappa(y <= d) = g - 1
end