Comparing 2 arrays and selecting some out of them

Hi, i want to compare the elements of 2 arrays and choose the tequested values and use them in multiplication. Lets say i have 2 arrays p=[7 3 -1 2 20] and q=[1 5 -4 9 20]

and i want to find out the values of , r1 = p*(p<q). Here is what i've done so far but i seem to be stuck here because i don't know any other function to use.

p=[7 3 -1 2 20];
q=[1 5 -4 9 20];

r1 == p*[p<q];
r1

Answer 1

[madhan ravi]

r1 = p(p<q);

[madhan ravi]

Or

r1 = p.*(p<q);

[Ilker Enes Çirkin]

but when i do this it only multiplies the logical answers. What i mean is the result of (p<q) is [0 1 0 1 0] so when i multiply it with the p it shows [0 3 0 2 0] which is not what i am asking for. I am asking for the code to pick the bigger number of these two and multiply that numbers with p.

[madhan ravi]

What's the expected answer for the given example?

Perhaps you need:

r1 = p .* max(p, q)

Or

r1 = p(:) .* p(p < q);

[Ilker Enes Çirkin]

the expected answer is [0, (3*5), 0, (2*9), 0] i used the paranthesis for you too see. i only want the bigger ones of the q to be multiplied with p

[madhan ravi]

r1 = (p .* q) .* (p < q);

[Ilker Enes Çirkin]

that makes a lot of sense man thank you very much.