indexing error, out of index error

function [itemcontextVector] = item_contextReader
category = [];
size = [];
sdir1  = 'E:\MS Thesis\Data\RentTheRunwayDataset\';       
sfile1 = 'item_category_num.csv'; 
xdata  = dlmread([sdir1,sfile1]);
tic;
ndata  = size(xdata,1)   % 1=rows, 
fdata  = size(xdata,2);  %  2 =cols
for i=1:ndata
    mov      = xdata(i,1);
    f        = xdata(i,2:fdata);        
    category (i,1:fdata-1) = [f]; 
end
itemcontextVector= [category];

toc;

this is the code, the data set has above thousand row and 2 columns, but when i try to get the number of row through "ndata = size(xdata,1) ", i got the following error:

" Index in position 1 exceeds array bounds.

Error in item_contextReader (line 20)

ndata = size(xdata,1) ,"

why this error is happining and what is the best possibe solution,? the Responce will be appreciated, thanks

:: the same line of code is working with other similiar files

Answer 1

[Walter Roberson]

size = [];

size is now an empty variable

ndata  = size(xdata,1)

You are trying to index the empty variable