Accessing value of a variable inside a function
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I have a variable, " c " defined outside a function as shown (just an example):
c=5;
function sum = add(a, b)
sum = a+b+c
end
Calling the add function by giving inputs for a, b Matlab throws an error saying : Local function name must be different from the script name. I want the value of the variable "c" to be accessed within the function so that if I give input of (2,3) for (a,b) I should be getting an output of sum = 10. Everything works fine if the variable " c " is inside the function but doesnt work when its outside the function. I tried to globally define the variable "c" like:
global c
c=5;
function sum = add(a, b)
global c
sum = a+b+c
end
But still Mathlab throws an error. Can anybody help me with this?
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Stephen23
2020-12-30
I suspect that you should be parameterizing the function:
Avoid global variables, they cause more problems than they solve.
采纳的回答
Image Analyst
2020-12-30
The global case should not throw an error. However you should not use sum or add as the name of your variables since they're already built-in functions. Is the function in the same m-file as the script? When I do this, all in the same m-file, it works fine:
global c
c=5;
s = myAddition(10, 20)
function theSum = myAddition(a, b)
global c
theSum = a+b+c
end
So, does that work for you? If not, what did you do differently?
2 个评论
Image Analyst
2020-12-30
Do not call it add.m. That could cause a problem with the other built-in add functions. So rename it and upload/attach it here. If it's essentially the same as mine, it should run fine.
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Walter Roberson
2020-12-30
编辑:Walter Roberson
2020-12-30
When you define a script, and you define a function inside the script, then the name of the function cannot be the same as the name of the script.
Also, when you define a variable in a script, functions defined in the script do not have access to the variable. Shared variables are possible only with nested functions.
I suggest that you read
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