MATLAB: Variables become undefined although they are saved in Workspace

undefined variablexml

I read XML file using GUI pushbutton, extract some data, and do some manipulations for them. The thing is although I save the required variables to workspace (using assignin), I can't use them outside the pushbutton callback function for further manipulation because matlab tells me 'undefined variables'! any suggestions? Thanks

Best Answer

Did you also define the workspace location?

e.g.

assignin('base','your_variable_name',your_variable_value);

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1- Avoid using global variables, there are several better ways to share data, use arguments to share data or in your case (the title message) you can use myvar = evalin('base', 'myvar') to get the workspace value of myvar into your gui functions.

2- When declaring global variables you must declare them global in all the functions you want to use them

fun1()
global myvar
end
fun2()
global myvar
end

MATLAB: Matlab error: A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval

gamma is a function that ships with matlab. I suspect that you never intended to call that function, but instead intended to use a value that you call gamma.

However, in both your polyblock and bisection since you never create such gamma variable, matlab calls the gamma function instead every time you write something = gamma. This stops working when you try to assign a value to gamma, since you can't assign a value to a function. At this point matlab tells you: Hey, up to now you called the gamma function, now you're trying to use it as a variable. What's going on?

I can't see anywhere where you actually defined something called gamma, so I'm not clear what gamma is supposed to be.

Best Answer

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MATLAB: Matlab error: A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval

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