In this code i used boolean true and false ,but it's not working. What can i use insted of boolean true and false?

f=imread('image1.jpg');
T = f;
T(T>60) = 255; 
imshow(T)
imwrite(T,'C:\Users\VAIO\Documents\MATLAB\iso_image.jpg','jpg');
  for i=1:1:M
      { 
          start = false;
          for j=1:1:N 
          {
              if ((T<60) && (start=false))
                { 
                    temp1=j;
                    start=true;
                }
             if((T<60)&&(start=true))
                  temp2=j;
           }
           dis[i]=temp2-temp1;
       }

Answer 1

[Thorsten]

The code in the if-clause is probably wrong. First, you probably want to compare a particular element of T, i.e., T(i,j) against 60. Second, use == to check equality:

if T(i,j) < 60 && start == false

Note that you don't need the extra parentheses in Matlab but you can use them if you consider it to be more readable:

if (T(i,j) < 60) && (start == false)

Same for the other if-clause.

[Umme Tania]

i tried your suggestion but now it shows error 'The expression to the left of the equals sign is not a valid target for an assignment.' indicating where i declare start =false

[Lokesh Ravindranathan]

Could you provide the updated code? Its possible that you are using = operator instead of == operator.

[Umme Tania]

f=imread('image1.jpg');
T = f;
T(T>60) = 255; 
imshow(T)
imwrite(T,'C:\Users\VAIO\Documents\MATLAB\iso_image.jpg','jpg');
    for i=1:1:M
        { 
            start = false;
            for j=1:1:N 
            {
                if T(i,j)<60 && start==false
                  { 
                      temp1=j;
                      start=true;
                  }
               if T(i,j)<60 && start==true
                    temp2=j;
             }
             dis[i]=temp2-temp1;
         }

Answer 2

[Walter Roberson]

MATLAB does not use {} to mark blocks. MATLAB uses {} to create cells. MATLAB uses "end" to mark the end of blocks.

For example instead of

for i=1:M { code }

MATLAB uses

for i=1:M; code; end