If condition for all elements of array

for i=1:n-2
    
    for j=i+2:n
        k_arr=i+1:j-1
        for counter = 1:length(k_arr)
            k = k_arr(counter);
            if all(w(k)<(w(i)+((w(j)-w(i))*(t(k)-t(i))/(t(j)-t(i)))))
                A(i,j)=1;
                A(j,i)=1;
            else  A(i,j)=0;
                A(j,i)=0;
            end
            disp('cycle completed');
        end
    end

In output I am expecting 1 only when if condition is true for all elements from k_arr(array) but it is giving output 1 even single element of array satisfy the condition. Please help me

Answer 1

[Walter Roberson]

if all(w(k)<(w(i)+((w(j)-w(i))*(t(k)-t(i))/(t(j)-t(i)))))

You are indexing all variables there, and each time you are indexing with a scalar. Because of this, the part inside the all() is always a scalar result, so the all() is not doing anything useful for you there.

Now, if you were to do

    for i=1:n-2
        for j=i+2:n
            k_arr=i+1:j-1
            k = k_arr;
            if all(w(k) < (w(i)+((w(j)-w(i))*(t(k)-t(i))/(t(j)-t(i)))))
              A(i,j)=1;
              A(j,i)=1;
            else
                A(i,j)=0;
                A(j,i)=0;
            end
        end
    end

[Beeraiah Thonti]

Thank you I tried this and this working for array(test case I tried) but when I applied this for a data file(txt file contains column matrix) it is giving error al below

Error using <

Matrix dimensions must agree.

Error in visalgo (line 26)

if all(w(k)<(w(i)+((w(j)-w(i))*(t(k)-t(i))/(t(j)-t(i)))))

Could you please solve this

[Walter Roberson]

I predict that your w and your t do not have the same orientation.

    for i=1:n-2
        for j=i+2:n
            k_arr=i+1:j-1
            k = k_arr;
            if all(reshape(w(k),[],1) < (w(i)+((w(j)-w(i))*(reshape(t(k),[],1)-t(i))/(t(j)-t(i)))))
              A(i,j)=1;
              A(j,i)=1;
            else
                A(i,j)=0;
                A(j,i)=0;
            end
        end
    end

[Beeraiah Thonti]

Brilliant how couldd I miss a basic thing Thank you