numel errors in matlab

hi,

im trying to write a program in matlab but i have some problems. there is some parts of my program. i hope you can help me.

-------------------------------------------------------------------

cd=xlsread('data.xlsx', 1, 'C3');

va=xlsread('veri.xlsx', 3, 'B3:B198');

d= xlsread('veri.xlsx', 3, 'C3:C198');

... and other datas

for i=1:1:198

wl(i,1)=0.5*ro*cd*a*(v(i,1)/3.6)^2;

...

w(i,1)=wl(i,1)+wr(i,1)+wb(i,1)+ws(i,1);

Ne(i,1)=w(i,1)*(va(i,1)/3.6)/(mv*1000);

...

n(i,1)=(va(i,1)/3.6)*60*ik(i,1)*ie/(2*pi*rd);

if n(i,1)>4500

    g(i,1)=g(i,1)+1;

end

Nex=xlsread('data.xlsx', 4, 'C2:M2');

nx=xlsread('data.xlsx', 4, 'B3:B11');

bex=xlsread('data.xlsx', 4, 'C3:M11');

be(i,1)=interp2(Nex,nx,bex,Ne(i,1),n(i,1));

--------------------------------------------------------------------------

 my first problem is;

??? Attempted to access n(2,1); index out of bounds because numel(n)=1.

Error in ==> tye at 82

if n(i,1)>4500

when i delete that line there is another same problem ;

??? Attempted to access n(2,1); index out of bounds because numel(n)=1.

Error in ==> tye at 87

be(i,1)=interp2(Nex,nx,bex,Ne(i,1),n(i,1));

what is my fault. please enlighten me.

thank you very much.

Answer 1

[Titus Edelhofer]

Somewhere there is missing an "end", does the end of the for loop comes after the line "be(i,1) = interp2(...)"? Second: does a "clear" before running the code help?

Titus

[Titus Edelhofer]

BTW, cd is not too good a choice for variable name because it's an important builtin function. That is not the reason of your problems though.

Answer 2

[Matt Tearle]

My guess is that your line

n(i,1)=(va(i,1)/3.6)*60*ik(i,1)*ie/(2*pi*rd);

is resulting in an empty array on the right-hand side. This would result in n having only one value (for i = 1). To verify, enter

dbstop if error

and run your code. It should stop and enter debug mode on the line that is causing the problem. Evaluate that right-hand side:

K>> (va(i,1)/3.6)*60*ik(i,1)*ie/(2*pi*rd)

You may also want to look at the variables you're referencing in that command: va, ik, ie and rd.

The whos command may also be of use.

Answer 3

[kosar akduman]

Titus Edelhofer i wrote "clear all, close all" before all codes. and there is no "end" problem with my iterations. thanks for answers but its not my answer.

Matt Tearle n(i,1) operation is resulting only 2 iterations. i mean it runs for i=1 and i=2.

[Matt Tearle]

But your code has "for i=1:1:198". But, either way, the error message implies that the problem is occurring when i = 2.

Did you try dbstop if error? You can check the value of i when the error occurs and you go into debug mode.