How can we write the for loop for accessing a table data?

i want to perform operations on a table data, for that i need to access data of table using its index and again updated value of that index data should be stored at the same position.

• * For Example: * * A table having 3 columns and 10 rows, i have written following code but its not working,

for i=1:10
  for j=1:3
      if j==1
          x=x<=5
      else if j==2
          x=x<=15
      else 
          x=x<=25
      end
  end
end

Please correct my code......

[Amit]

You know x<=5 will create a logical vector for 0 where the conditions dont satisfy and 1 for where it will.

[Amit]

Moreover, by x<=5, are you trying to createe a logical vector for the whole matrix or just that column?

Answer 1

[Walter Roberson]

for i=1:10
  for j=1:3
      if j==1
          x(i,j) = x(i,j) <= 5
      else if j==2
          x(i,j) = x(i,j) <= 15
      else 
          x(i,j) = x(i,j) <= 25
      end
  end
end

[kelvina]

thanx, its working

Answer 2

[Amit]

If Walter's interpretation is correct, then you do not need so many loops. A single loop approach will be:

A = [5 15 25];
for j = 1:3
  x(:,j) = x(:,j) <= A(j);
end

or no loop way:

   x = x <= repmat([5 15 25],10,1);