3 replies to this topic

[i am lido]

Dear all

 

I face a problem with for loop in matlab. My equation is 

Jw(i) = p1 - p2*Jw(i)/(1+B/Jw(i))-P

 

when I use for loop to step size Jw(i), the output show NaN because this term (B/Jw(i)) . This Jw is in divided term.

When I rearrange this equation, this term is still appear.

 

How to solve this problem? Please help me.

 

Best regards,

Lida

[serra]

normally Matlab manages well (and reports) floating point errors,

some possible causes

|Jw(i)| ~ 0

index i outside range

but there may be others

[Pilesar]

Test for Jw(i)=0 in your algorithm inside your loop. Then take steps to avoid dividing by zero.

[Francisco Angel]

You could try with the isnan function:

 

http://www.mathworks.../ref/isnan.html

 

To detect the cases, and be capable of completing the loop.

 

Best regards.