Matlab accessing global variable from another m file?
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so let say I have two files fileA.m & fileB.m in fileA.m I have this code
function fileA()
global dataX;
dataX = 100;
end
in fileB.m I want to use if to check the value this is what I have in fileB.m
function fileB()
if dataX == 100
fprintf('Value is %f \n' , dataX);
else
fprintf('Value is NOT %f \n' , dataX);
end
end
however I'm having problem every time I run fileB.m I get this error Undefined function or variable 'dataX'.
so how can I access global variable from another .m file .. I'm new to Matlab
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Star Strider
le 7 Oct 2015
However if you must, you have to declare them as globals in every workspace that uses them. They don’t just magickally appear!
function fileB()
global dataX
if dataX == 100
fprintf('Value is %f \n' , dataX);
else
fprintf('Value is NOT %f \n' , dataX);
end
end
2 commentaires
Star Strider
le 7 Oct 2015
My pleasure.
MATLAB has its own rules about such things as globals. It is still best to pass ‘dataX’ and anything else your function needs as an argument rather than a global.
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