# Access matrix values inside of a function

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Christian S. 2021년 3월 2일
댓글: Christian S. 2021년 3월 4일
Hi MATLAB-Folks,
I'm asking with a beginner problem for your help, I searched the forum for an answer but without sucess:
I have a script, that creates a vector, lets say as an example:
>> g_x_contact=[0 0 1 2 3 4 0 0]
afterwards I'm creating a function, that uses the corresponding value of the vector within.
For example:
function Integral = pressure_integral(x)
Integral = g_x_contact(x).*(x/2)
end
So I want the function to use the value at position x and calculate the according steps afterwards.
Here the promt-line >> pressure_integral(6) should calculated with the sixth element: 4.*(6/2)=12
Instead I get the error-Message
Unrecognized function or variable 'g_x_contact'.
Error in pressure_integral (line 6)
Integral = g_x_contact(x).*(x/2)
Can anybody give me a hint, how the access the Vector?
Thank you in advance and very best
Christian

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### 채택된 답변

Bob Thompson 2021년 3월 2일
편집: Bob Thompson 2021년 3월 2일
I believe this is the purpose of global variables, but I could be wrong. I don't really use them much.
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Christian S. 2021년 3월 4일
Thank you guys very much!

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R2020b

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