Vector into the function showing scalar variables used

Hello! I have a "function a=fun(b,c)". The input variables b and c called into the function are both scalar. How can I create a vector into the function containing all values (b,c) called, together or separated, during the loop time in order to make accounts between new values and the previous one?

[madhan ravi]

Well, you haven’t shown us how your function looks like and the expected output.

[Heorhii Heorhiichuk]

In my specific case, I have like input, an so outside the function, scalar velues. There are no ways into the script which calls the function to vectorize the input values. To make me better understand, I inserted the structure of the function:

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function ang_rot=rotazione(t,omega)

In this case t and omega are both scalar!

Something that generates me a vector [t0 t1 t2 ... tk] (need your help!)

Something that generates me [omega0 omega1 omega2 ... omegak] (need your help!)

where k shows the current value in order to make...

diff_t=t(k)-t(k-1);

diff_omega=omega(k)-omega(k-1)

ang_rot=diff_t*diff_omega

end

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All that I need is to account, inside the function, at given time step one value with that of the previous time step considering that they are scalar as input.

Thank you for your time!

Answer 1

[Walter Roberson]

bvals = [-2 3 4 21];
cvals = [1/2 1 2 4 8 16];

numb = length(bvals);
numc = length(cvals);
f = zeros(numb, numc);
for cidx = 1 : numc
    c = cvals(cidx);
    for bidx = 1 : numb
        b = bvals(bidx);
        f(J,K) = fun(b, c);
    end
end

When you have control over fun it is often (but not always) possible to adjust it a bit to be able to calculate multiple values when b or c are vectors or arrays.

[Heorhii Heorhiichuk]

In my specific case, I have like input, an so outside the function, scalar velues. There are no ways into the script which calls the function to vectorize the input values. To make me better understand, I inserted the structure of the function:

----------------------------------------------------------------------------------------------------------------------

function ang_rot=rotazione(t,omega)

In this case t and omega are both scalar!

Something that generates me a vector [t0 t1 t2 ... tk] (need your help!)

Something that generates me [omega0 omega1 omega2 ... omegak] (need your help!)

where k shows the current value in order to make...

diff_t=t(k)-t(k-1);

diff_omega=omega(k)-omega(k-1)

ang_rot=diff_t*diff_omega

end

----------------------------------------------------------------------------------------------------------------------

All that I need is to account, inside the function, at given time step one value with that of the previous time step considering that they are scalar as input.

Thank you for your time!

[Walter Roberson]

function ang_rot = rotazion(t,omega)
  persistent old_t old_omega
  ang_rot = 0;
  if ~isempty(old_t)
      ang_rot = (t-old_t) * (omega-old_omega);
  end
  old_t = t;
  old_omega = omega;
end

[Heorhii Heorhiichuk]

Thank you very much! This function works exactly as I needed