How can I create matrix with parameter?

I wish to create a matrix based on different energy and its maximum recoil energy.

The maximum recoil energy formula is T_max = E/[1+M/(2*E)]

The example as below:

Energy, E (MeV) Recoil Energy, T

1 0 0.01 0.02 0.03 T_max_1 0 0 0

2 0 0.01 0.02 0.03 0.04 ... T_max_2 0 0

3 0 0.01 0.02 0.03 0.04 0.05 ... T_max_3 0

4 0 0.01 0.02 0.03 0.04 0.05 0.06 ... T_max_4

So for each energy, I know the maximum recoil energy for each E.

For each row of E, I want to start with 0 with energy bin width 0.01 and end with their own maximum recoil energy. Anything more than their own maximum recoil energy should be zero.

I can caculate the T_max and then write it as [0:0.01:T_max] for each energy. However, I don't know how to put all of the recoil energy into a single matrix and made anything more than their T_max is equal to zero. It can be very tedious if I have a lot of energy group and very small energy bin width.

Hope if anyone can suggest a better way to solve this problem. Thank you!

Answer 1

[Matt J]

It seems like the kind of thing you would want a function for, rather than a matrix.

RecoilEnergy=@(E,r) r.*(r<=E./(1+M./(2*E)))

[Hokkien]

I see. Thank you so much for the solution!