Keep getting error message

Above is the pompt we are to follow to get the correct output, using fopen to get the data from a different file.

%*****CONSTANT*****
NUM_MONTHS = 12;
FIRST_YEAR = 2013;
LAST_YEAR = 2016;

%*****INPUT*****
month = 1:NUM_MONTHS;
year = FIRST_YEAR:LAST_YEAR;
% read data file
FID = fopen('lake_powell.txt','r');
lake_powell(month,year) = fscanf(FID, '%f', 1);
fclose(FID);


%{
Unable to perform assignment because the indices on the left side are not compatible
with the size of the right side.

Error in assign06b (line 22)
lake_powell(month,year) = fscanf(FID, '%f', 1);
%}

Above is the code I currently have, followed by the error message. I don't understand what I am doing wrong, could someone please explain and put me on the right track?

Answer 1

[Walter Roberson]

If the file is empty or does not start with a number, then fscanf() would return empty, and empty cannot be stored in a particular location.

Note: It is unlikely that you want to keep reading from the same location in the file. You probably do not want the fopen / fclose to be inside the loops.