Matlab gives NaN when i use the name of a variable

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Yagmur Gencoglu 2019-6-3

评论： Walter Roberson 2019-6-4

Greetings,

I have been working on an optimization code with a lot of iterations.

I wrote an equation with syms in it to use. But when i try to use eval for one of the equations, it gives me NaN.

For example at the following part of the code;

"Ccurr = eval(subs(F,alph,alpha));

Cnew = eval(subs(F,alph,alphanew));

erralpha = abs((Cnew-Ccurr)*100/Ccurr);

alpha = alphanew;"

Here, Cnew is seen as NaN. But when i write "Cnew = eval(subs(F,alph,58473000))" directly with the value of alphanew; it gives a numerical result.

How can i fix this?

Thanks in advance.

SRH is actually calculated before the while loop starts. Again, when i put anything else in place of "alphanew" i get a result.

Thanks for your answer.

Walter Roberson 2019-6-4

We cannot test without knowing the values of all variables you use in the code.

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