Thread Subject: strange problem

I use length function to get the row number for one matrix.
a=[1 2;3 4];
length(a(:,1))% should be 2
It works well. But today it does not work.
when I use length(a(:,1)),it said"??? Index exceeds matrix dimensions."
It is very strange.

x = ones(1,8);
n = length(x)
then MATLAB shows
n= 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515

what's wrong?



"yunzhi cheng" <sjtu_yh@yahoo.com> wrote in message <f8nior$82s$1@fred.mathworks.com>...
> I use length function to get the row number for one matrix.
> a=[1 2;3 4];
> length(a(:,1))% should be 2
> It works well. But today it does not work.
> when I use length(a(:,1)),it said"??? Index exceeds matrix dimensions."
> It is very strange.

yunzhi cheng:
<SNIP function-is-var evergreen...

> x = ones(1,8);
> n = length(x)
> then MATLAB shows
> n= 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515 0.1515...

most likely, you created a variable <length>...
hence, this should help

     clear length;
     x=ones(1,8);
     n=length(x)
% if NOT, show CSSM the output of this
     which length -all

us

You help.
Thanks.