If statement not giving the desired output

I am using a simple if statement but it is not returning the correct result even when the condition is satisfied. No errors are showing.

e and M are user defined and converted from string to double using str2double on input!

M_1=[[]];

for i=1:1:size(M,1)
       for j = 1:1:size(M,2)
         if (M(i,j)< 157.02 + e)& (M(i,j)>157.02- e)
             M_1 (i,j) = "A";
     
        else
             M_1(i,j) = "0";
        end
      end
     
  end

Answer 1

[Ameer Hamza]

Writing

M_1=[[]] 

define it as an empty double array. Try following code

M = 200*rand(5); % example values
e = 5;
M_1=strings(size(M));

for i=1:1:size(M,1)
    for j = 1:1:size(M,2)
        if (M(i,j)< 157.02 + e) && (M(i,j)>157.02- e)
            M_1 (i,j) = "A";
            
        else
            M_1(i,j) = "0";
        end
    end
end

[Dua Fatima]

Its still returning all zeroes

[Ameer Hamza]

Have you exactly copied and pasted the code from here? Can you show the code you are running?

[Dua Fatima]

It's running alright but in my case, M comes from an absolute value after subtraction:

for i=1:1:n
    for j = 1:1:n
        M(i,j)= abs(A(i)-A(j));
    end
end

%A is an array storing user defined values which are converted to double by str2double 

[Ameer Hamza]

What are the values in A? I mean in which range? If this condition

M(i,j)< 157.02 + e) && (M(i,j)>157.02- e

is not satisfied, you will get all zeros.

[Dua Fatima]

It's working now!

Thanks alot!

[Ameer Hamza]

I am glad to be of help!