Index exceeds matrix dimensions.

hi,

I have used this code here:

for i=1:length(data8(:,1))

if(data8(i,8)>1.1)
data8(i,:) = [];
end
if(data8(i,8)<0.9)
data8(i,:) = [];
end
end

where data 8 is a matrix with 8 columns, and I get this error message:

Index exceeds matrix dimensions.

Error in construct_data (line 43) if(data8(i,8)>1.1)

has anybody an idea why this can happen?

Answer 1

[Cedric]

 length(data8(:,1))

is evaluated only once at the beginning of the FOR loop. It is e.g. 10. Then you remove rows from data8 , whose size therefore decreases (9 rows, 8 rows, ..). At one point the loop index (that is still incremented until it hits 10) becomes larger than the remaining number of rows in data8.

[Locks]

is there something I can do that it's dynamic and still running?

[Cedric]

Several ways, one is:

 i = 0 ;
 while i < size(data8, 1)
    i = i + 1 ;
    % .. whatever you have to do.
 end

[Locks]

great, thanks!