How can I change the dimension of a global variable?

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I want to define a global variable:
global v
v=[1 2]
but I have this error: Size mismatch (size [1 x 1] ~= size [2 x 1]). The size to the left is the size of the left-hand side of the assignment. How can I change the dimension of v? In the data store memory?
  7 Comments
alessandro
alessandro on 23 Jun 2014
Edited: alessandro on 23 Jun 2014
ok, I try to explain with more details. I have to simulate an inverter modulation in simulink. In the image I show which blocks I've used. Inside the Matlab function there is the code. In this code I've to define a global variable, so I used a Data Store Memory(Help Matlab) like in the second image. In the code I just define a funcion like:
global v
v=[1 2]
but didn't work. I have this error: Size mismatch (size [1 x 1] ~= size [2 x 1]). The size to the left is the size of the left-hand side of the assignment. So I want to change the dimension of the global variable.

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Answers (1)

Star Strider
Star Strider on 23 Jun 2014
I cannot reproduce the error in R2014a. It works even if I assign v before I declare it as a global. However this:
v = pi
global v
v = [1 2]
throws this warning:
Warning: The value of local variables may have been changed to match the globals. Future versions of MATLAB will
require that you declare a variable to be global before you use that variable.
What version are you using?

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