Error using sprintf command

sprintf('Iteration: %d, Sum: %d, difference: %d',a, SUMSED(a,1), diff_(a,1))

The system cannot find the path specified.

Unrecognized function or variable 'SUMSED'.

[KSSV]

Use fprintf.

The error is clear, SUMSED is not defined.

[Walter Roberson]

sprintf() is fine in this context.

If you have any "if" statements, then it possible that none of them came out true. That can especially happen if you accidentally test an entire vector instead of one element of the vector.

[Nitesh Kumar Singh]

%  6. Convergence control
    % SUMMATION OF SED PER ITERATION
    Q(a,1) = 0;
    for i = 1:N_ele
        Q(a,1) = sed(i,a)+Q(a,1);
    end
     % CALCULATION OF DIFFERENCE OF SED OF
    % TWO FOLLOWING ITERATIONS
    if (a>1)
        q_dot(a,1) = abs(Q(a,1) - Q(a-1,1));
    else
        q_dot(a,1) = 0;
    end
    % OUTPUT
    sprintf('Iteration: %d, Sum: %d, difference: %d',a, SUMSED(a,1), diff_(a,1))

1. Error is still coming after using fprintf. @KSSV

2. i am not using any "if" statement here but all the code is working in "for loop". @Walter Roberson

[Walter Roberson]

You do not assign to SUMSED anywhere in that code.

However, your variable Q appears to be a total (sum) of sed values.

[KSSV]

It seems Q is SUMSED.

[Image Analyst]

Why are you not using the sum(), cumsum(), and diff() functions to do this?

[Nitesh Kumar Singh]

i have change sumsed to Q and diff_ to q_dot and its working well.

Actually sir i am studying a someon else's code @Image Analyst.

thank you sir @Walter Roberson, @KSSV and @Image Analyst.