How do I use a variable assigned in one function to call another function?

Question

Neil 2022-10-8

0
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回答： Davide Masiello 2022-10-8

I am trying something similar to

global a
a = 5
global b
b = 10
name1(a, b)
name2(x, b)
function[x] = name1(a, b)
global a
global b
x = a + b
end
function[y] = name2(c, d)
global b
y = x + b
end

Do I need to make variable x global inside of a function or something else? I tried setting it global inside and outside of the function and I still couldn't call function y with variable x. What am I doing wrong?

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Answer 1

dpb 2022-10-8

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在 MATLAB Online 中打开

Forget global exists; for virtually all cases, it's not the better solution. Instead, use the return values your function(s) calculate and pass the result of the first to the second.

NOTA BENE: Functions have their own name space; arguments in the function definition are "dummy" arguments that are known by name only within the context of the function; naming them as something in the calling workspace has no bearing whatever on what their values will be at run time; they're only associated with an actual value by the linkage from the calling statement.

a = 5;
b = 10;
c=name1(a, b);
d=name2(c, b)
d = 25

NOTA BENE SECOND:

That the result of a function call can be used as the argument to another function -- the above is the same as

d=name2(name1(a,b), b)
d = 25
function[x] = name1(a, b)
  x = a + b;
end
function[y] = name2(a,b)
  y = a + b;
end

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Answer 2

Davide Masiello 2022-10-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1820285-how-do-i-use-a-variable-assigned-in-one-function-to-call-another-function#answer_1069655

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The code does not global variables at all

a = 5;
b = 10;
x = name1(a,b)
x = 15
y = name2(x,b)
y = 25
function out = name1(var1,var2)
out = var1 + var2;
end
function out = name2(var1,var2)
out = var1 + var2;
end