Matrix Dimensions must agree

[EDIT: 20110526 14:35 CDT - reformat - WDR]

I am running the following script and I get the error message below.

=== ERROR =====
??? Error using ==> eq
Matrix dimensions must agree
=== ERROR =====

If I look at the output from the recCnt it has count of the last record in the file, so I am really stumped. It seems to work until it gets to the end of the file and then dies.

Any Suggestions?

file_option=fopen('C:\Users\Sample with Dividends.csv');
A=textscan(file_option,['%s %s %s %f %s %f %f %f %f %f %f %f %f %f %f %f %s %s %s %f %f %f %f %f %f %f %s %f %f %s %f %s'],  'delimiter',',','HeaderLines', 1);

%%%Option input%%%%
Date1=datenum(A{:,1});
expiration1=datenum(A{:,3});
strike1=A{:,4};
callORput=A{:,5};
%option_symbol=A{:,6};
bid1=A{:,6};
ask1=A{:,7};
mean_price=A{:,8};
openInt = A{:,9};
volume = A{:,10};
IV1=A{:,11};
delta1=A{:,12};
Gamma1=A{:,13};
theta1=A{:,14};
vega1=A{:,15};
rho1=A{:,16};
%
symbol = A{:,17};
name = A{:,18};
stockOpen = A{:,21};
stockHigh = A{:,22};
stockLow = A{:,23};
stockClose = A{:,24};
priceClose = A{:,25};
divFreq = A{:,26};
divCalcDate = A{:,27};
divID = A{:,28};

lastDivAmt =A{:,29};
lastDivDate = A{:,30};

prev_Symbol = symbol{1};
recCnt = 0;
length(Date1)

for i = 1:length(Date1)
    if symbol{i} == prev_Symbol
        recCnt = recCnt + 1;
        %display ( recCnt)
    else
        display (recCnt)
        prev_Symbol = symbol{i}
        recCnt = recCnt + 1;
    end
end

Answer 1

[Walter Roberson]

You are attempting to compare two character arrays using "==". That works as long as the character arrays are exactly the same length, but fails if they are different lengths. You should be using strcmp() instead of "==".