Index issue with using a global variables that are vectors in a function
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Robert Mason
il 2 Ago 2016
Modificato: Stephen23
il 2 Ago 2016
I have written a function in which two global variables, both vectors with 2 entries, are used:
function TH=THETA(y, z);
global qv;
global dv;
TH=qv(y) + z*((qv(y))^2)/(1 - (dv(y))*z);
When I call the function, such as with THETA(1, 0.5) or THETA(2, 0.5) , I get the following error:
"Index exceeds matrix dimensions."
I am puzzled by this as the index in question, the first argument of THETA, is 1 or 2, and the vectors in the function both have two entries. What might be the problem?
1 Commento
Stephen23
il 2 Ago 2016
Modificato: Stephen23
il 2 Ago 2016
"What might be the problem?"
The decision to use global variables is the problem.
This is a classic example of code using globals: buggy, and hard to debug.
Sadly, beginners keep on insisting on using globals for every little task with more than one workspace, and are then surprised when it turns out to be impossible to understand and impossible to debug.
If you need to pass parameters, then read this:
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Azzi Abdelmalek
il 2 Ago 2016
Why are you using global? you can simply write
function TH=THETA(y, z,qv,dv);
TH=qv(y) + z*((qv(y))^2)/(1 - (dv(y))*z);
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