condition exist and not exist

Hello,

i would to ask how can i make a condition if the string exist in file so there is a variable for example 1. Meanwhile, if the string is not exist then there is variable equal to 0.

This is example of my file.

The name of the file is F1_ION17009.FRS & F1_ION17010.FRS.

This is example of my code:

clear all;
clc;

% output=fopen('ND_ISK1_ISK3.txt','wt');

start=17000; % start_date 1/1/2017
bsl_header=[];
% ISK1_ISK3=[];
% Date=[];
% BSL=[];
% Epoch=[];
% Sat1=[];
% Sat2=[];
% Residual=[];

%load file
% i=10
for i = 9:10

y_doy=start+i;
date=start+i;
name=num2str(y_doy);
file=str2double(name);
load= sprintf('F1_ION%s.FRS',name);
fprintf('%s\n',load)

myfile=fopen(load);

bsl13num=[];
bsl15num=[];
while 1;
    readfile=fgetl(myfile);
    bsl13=findstr(readfile,'ISK1 ISK1         ISK3 ISK3');
    bsl15=findstr(readfile,'ISK1 ISK1         ISK5 ISK5');
    if ~isempty(bsl13);
        bsl13num=str2double(readfile(2:4));
    end
    if ~isempty(bsl15);
        bsl15num=str2double(readfile(2:4));
    end
    if readfile==-1
        fprintf('Done taking baseline ISK1-ISK3 number information for %s file \n',load);
        break;
    end
end

end
bsl_header=[bsl_header;file bsl13num bsl15num];

end

The ouput that i want should be like this:

bsl_header=[17009 0 9;17010 10 11]

Can someone help me about this question?

[Nazrin Afiq Abdul Rahman]

im using matlab R2008b

[Bob Thompson]

Getting an existance check to return 1 or 0 just means you need to apply some logic to it. I'm not sure how you're using the 1 and 0 in your desired output, or where you're looking to do the check within your code. Are you trying to inject a 0 in your output array if no string is found in the findstr check?

To check if a string exists, I recommend just applying logic to look for an empty findstr result.

existcheck = ~isempty(bsl13num);

[Nazrin Afiq Abdul Rahman]

yeah. i got the answer already. i just simply put another condition in the script plus i had to remake the script too but its okay since i already got the answer. btw thx bob