Undefined variable in workspace problem

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Máté Torma
Máté Torma 2021-11-25
编辑： Stephen23 2021-11-25
Hello everyone,
there's a seemingly simple problem that I can't solve unfortunately. I'd like to run the following, very simple code:
function measVal = dataIn(step)
measVal = measurementValue(step,1);
end
where measurementValue is an n x 1 double array already loaded in my workspace. But when I try to run the code, I get the following error:
Undefined function or variable 'measurementValue'.
What could be the problem here? Thank you in advance for your help.
  2 个评论
KSSV
KSSV 2021-11-25
What is measurementValue? Is it a function or variable? It seems it is a function, try to keep this function in the same pwd.
Máté Torma
Máté Torma 2021-11-25
No, it's an array filled with double values and loaded in the workspace:

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回答（1 个）

Stephen23
Stephen23 2021-11-25
编辑：Stephen23 2021-11-25
"where measurementValue is an n x 1 double array already loaded in my workspace."
I guess you mean that it is loaded into the base workspace (every function has its own workspace):
https://www.mathworks.com/help/matlab/matlab_prog/base-and-function-workspaces.html
Because you did not pass that variable as an input argument to that function, it is NOT in that function workspace.
"But when I try to run the code, I get the following error: Undefined function or variable 'measurementValue'. What could be the problem here?"
Very simple: the variable is not in the function workspace.
Simplest and most efficient solution: pass it as an input argument.

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