always having zero results

Hi,

I have a problem with my code.It just two equations to find unknown two values(Y,X). From the first equation, i get Y then, when I put Y in X equation, always having a value of X which is Zero. the x2 in the equation of X is 0.001.

X=0.25*((r1.^2-r2.^2-y1.^2+2*y1* *Y*)/ *x2*);

Y has an integer value and when i put its value such as 7, i get X=-1. But when i Put Y as a letter Y, i get X=0

Answer 1

[John D'Errico]

Well we cannot do anything with that equation, since it is not valid syntax. There are some spare * characters near the end. I'm not sure if that was a typo, if you did it intentionally, or what.

My guess however, is that Y is not just an integer, but it is probably an integer of form like int8, int16, etc. For example:

z = 0.001 + uint8(2)
z =
    2

whos z
Name      Size            Bytes  Class    Attributes
z         1x1                 1  uint8

So the result is not 2.001, but exactly 2, since the result will be uint8.

Had that integer been in double precision form, the issue would not arise.

[Walter Roberson]

I think in the original the user was possibly trying to bold some of the variables

[sukaina abbas]

Yes I bold Y and x2 any the problem is being solved by just separate the equation in two parts. Many thanks for your cooperation and help