Subscript indices must either be real positive integers or logicals

I have this simple program code

%------------------------GPS data loading---------------------------------%
data = load('data/sorted_coord.dat');
%--------------------------fault parameter info---------------------------%
fault   = load('data/fault.dat');
fa_lat  = fault(:,2);
fa_lon  = fault(:,3);
length  = fault(:,5)*1000; %convert to meters
width   = fault(:,6)*1000; %convert to meters
depth   = fault(:,4)*1000; %convert to meters
dip     = fault(:,8);
strike  = fault(:,7);
ss      = fault(:,10).*cosd(fault(:,9));
ds      = fault(:,10).*sind(fault(:,9));
op      = zeros(1,2)';

when I try to this command:

m = length(fa_lat);

then it will return error

Subscript indices must either be real positive integers or logicals.

does anyone has solution to resolve this error?

Answer 1

[Adam]

You have a variable called 'length' that is over-riding the function.

Never name variables the same as a builtin function (or your own functions for that matter).

I assume by

m = length(fa_lat)

you wish to call the builtin 'length' function, but instead it is trying to index into your 'length' array.

Rename your length array to 'len' or something else that isn't a function name and it should work.

which myVariableName

will tell you if a function exists with the name you wish to use as a variable where obviously 'myVariableName' would be 'length' or 'size' or some other tempting sounding name for a variable!

Answer 2

[hidayat]

Great, thanks for your answer