strrep with if statement use in matlab

s= strrep(origStr, oldSubstr, newSubstr)

    if  str1==strrep(str,'sport','1');
else if   str2==strrep(str1,'art','2');
else if   str3==strrep(str2,'art_u','3');
             end
         end
     end
what is the error ? and how to use if condition with strrep ??
if u have more replacing ?
art=2
'art_u' it's one word  will be  2_u  it is error 
the output is art=2 but,  art_u= 2_u   is wrong should be  3
how to solve ????

[Image Analyst]

What are the starting values of str, str1, str2, and str3? What are their values before you get to the "if" statement?

Answer 1

[Matt J]

You tell us what the error is. You haven't posted any error messages, nor given us any input data to test your code with. As a guess, though, you should probably be using the STRCMP command to compare the strings.

Incidentally, it would be more efficient to use the ELSEIF keyword, instead of "else if" all the time. Then you would require only one "end" to close the block.

 if condition1

 elseif condition2

 elseif condition3

 else

 end

[Matt J]

You should give us the code you are running and the input strings so that we can run it too. Also, say what the desired output should be.

[Matt J]

No, not necessarily. Neither of the following calls to strrep produces '2_u' as output. And the second one produces '3' as you say you want.

    >> str='art'; strrep(str,'art_u','3')

    ans =

    art

    >> str='art_u'; strrep(str,'art_u','3')

    ans =

    3