how to execute (cell) in operation (if then)? , data types: string, taken from the data excel.

I want to compare two string data. but when I use the expression for and if, it can not be run.

i'm sorry... this is my code... I am a beginner, please your help.

clear;
clc;
[data2,follower]=xlsread('follower.xlsx');
[data3,mention]=xlsread('mentions.xlsx');
[data5,wg]=xlsread('wg.xlsx');
n_vertex=length(follower(:,1));
wg=0;;
for i=1:n_vertex
for j=1:n_vertex
   if isequal(follower{i,1}==mention{i,1}, follower{i,2}==mention{i,2})
       if follower{i,1}==wg{i,1}
        wg=wg+data5(i,1)+1;
       end;
    end;
end
end

============================================================================== Error using ==> eq Matrix dimensions must agree.

Error in ==> oo at 17 if isequal(follower{i,1}==mention{i,1}, follower{i,2}==mention{i,2})

================================================================================ I want to make it again from (1) to n_vertex. but it seems there is something wrong .. please help, thank you.

Do not use the name of an individual as a Tag. Read the guide to tags and retag this question. See http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Roza, are you sure you don't want any answers at all from anyone else on the planet except for Jan Simon (outstanding though he may be)?

do not like it. I am very receptive to suggestions from anyone, including you. :)

Roza, Do not use the name of an individual as a Tag. Read the guide to tags and retag this question. See http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

ooh hehehe... sorry, i am newbie :)... thanks for the information

Instead of saying sorry, it would be more efficient to edit the tag. Although there are many Jan Simon's on the earth, the most famous is a female violinist, I assume the tag means me. Therefore I feel free to delete it.

You have posted the same question already two days ago. Walter's answer suggested STRCMP() already and was accepted.

Please avoid such "double-posting", because it confuses the readers and the ones, who spend time for answering. Thanks.

Answer 1

Do not use == to compare strings. Use strcmp()

if i want ~= , what should i use to compare string?

As Walter has said already: Use strcmp. And if you want to check for not matching strings, use strcmp(String1, String2) == 0 or the equivalent not(strcmp(String1, String2)). Please type "help strcmp" in the command window to find out more.