cam

what are you meaning?

Hi cnpower

I have polar data of B profile and need polar data of profile A. I would like find any mathematic formula ( numeric solving ). I use step half of degree.

You say that you have the polar coordinates of B; I am assuming in the form of (B,θ).

Would it not just be as simple as your new coordinates of A=B-R?? So that your new coordinates are ('B-R',θ) or am I missing something here?

I could see a little confusion if you had the coordinates of B as (x,y) so that maybe your new coordinates of A would perhaps be ('x-Rcosθ', 'y-Rsinθ')

Does that make any sense?

Hi,V3,

your question is challenge. I suddenly find I seem to get Zero at hte exam.

I remeber in the autocad has such function. I go over and try ro draw one as follow,

I use offest function.

I think the procedure will be:

find normal eqation from your orginal equation. suppose F(x, y)=0 [or polar equation]

2] utilize two points distance formula, to find another point in the new position. this distance us your's R,

the new point, say, x1,y1;

then based on the point and normal direction you can get the new equation.

during this procedure, you can change polar to orthogonal coordinates and then change again to polar coordinates.

however, its comp;lex.

another war, try to use similarity transformtion method in the complex function.

w = r Z.

but I forget this method at all.