Matrix Output Matlab Calculation

[Air]

I am making a script-m file to produce results of a formula in a Matrix output.

function s = calc(a, b)

i = [-a: 1: a];
j = [-b: 1: b];

k = i.^2 + j.*i;

A = [i' j' k']

disp('i  j  k'), disp(A)

But, it does not consider all combination. How can I make it stop at a 'i' value so all 'j' values can be matched to that and solved for 'k' before proceeding. In my code, it just does one round of 'i' and 'j' values.

 

[KLoux]

I'm not sure I understand the question...

If you want to create a matrix k that contains every combination of the i and j values, then you might try something like:

function s = calc(a, b)

i = [-a: 1: a];
j = [-b: 1: b];

%  Use an outer for loop to iterate through all of the i values (uses index u)
for u = 1:1:max(size(i))
    %  Use an inner for loop to iterate through all of the j values (uses index v)
    for v = 1:1:max(size(j))
        %  Here we construct k to have two dimensions, the first corresponding to
        %  the i value, the second corresponding to the j value
        k(u, v) = i(u)^2 + j(v) * i(u);
    end
end

%  If i and j are different lengths, MATLAB won't let you do this...
A = [i' j' k']

disp('i  j  k'), disp(A)

Hope this helps,

Kerry

 

[oswaler]

As a scientist, it is important to thoroughly consider all possible combinations in your calculations. In this case, you can use a nested for loop to iterate through all combinations of 'i' and 'j' values. This will ensure that all possible combinations are considered and the corresponding 'k' values are calculated before moving on to the next 'i' value. The updated code could look something like this:

function s = calc(a, b)

i = [-a: 1: a];
j = [-b: 1: b];

k = zeros(length(i),length(j)); %initialize k matrix with appropriate dimensions

for m = 1:length(i) %loop through all 'i' values
for n = 1:length(j) %loop through all 'j' values for each 'i' value
k(m,n) = i(m)^2 + j(n)*i(m); %calculate corresponding 'k' value
end
end

A = [i' j' k']; %create matrix with 'i', 'j', and 'k' values

disp('i j k'), disp(A) %display matrix

I hope this helps you achieve the desired output for your script-m file.