I have an equation. I want to adjust one of the values in the equation until it hits a certain output. How do I run a loop to increment that certain value until it does this?

equation: X/Y=P

Increase Y by an increment of 1 until gives an output equal or less than P.

Example:

X=21

Y=4

P=3

equation: 21/4=5.25

GOAL: increment Y unitl it gives an output less than or equal to P.

Answer 1

[Voss]

X=21;
Y=4;
P=3;

while X/Y > P
    Y = Y+1;
end

% this
Y

Y = 7

% is the first value of Y such that X/Y <= P
X/Y <= P

ans = logical
   1

% (the previous value doesn't work since 21/6 > 3)
X/(Y-1) <= P

ans = logical
   0

Answer 2

[Matt J]

X=21;
Y=4;
P=3;
increment=1;

Yp=X/P;

delta=ceil((Yp-Y)/increment);

Y=Y+delta

Y = 7