How to use if condition on a variable in MATLAB?

Question

Hi I am a newbie in MATLAB.

I have a variable named predictLabels which has values i.e 1,2,3,4. For each image the value of predictLabels changes. In workspace it shows as predictLabels = '1' etc.

Problem is, when i use if condition to that variable nothing hapens. Partial code given below-

if predictLabels == 1
    imshow(img);
end

The above code is not working. No error showing, even compiler is not entering in if statement. I think there is a function for this kind of condition check.

gnovice · Accepted Answer · 2017-07-25 05:01:36Z

2

The problem is that your variable predictLabels doesn't contain a numeric value. Instead, it appears to be either a character array ('1') or a cell array of characters ({'1'}). I'm guessing it's the latter, which is why it displays as ... = '1' instead of ... = 1. Whichever one it is, you should use strcmp instead of == in your conditional check:

if strcmp(predictLabels, '1')
  imshow(img);
end

If you'd like to check the data type of a variable, you can use the class function:

>> predictLabels = '1';
>> class(predictLabels)

ans =
char

Or you can use whos to check the data for the whole workspace:

>> whos
  Name               Size            Bytes  Class    Attributes

  predictLabels      1x1                 2  char

edited Jul 25, 2017 at 5:01

answered Jul 25, 2017 at 4:47

gnovice

126k16 gold badges259 silver badges364 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to use if condition on a variable in MATLAB?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related