MATLAB Answers

## Can anyone help me to understand the logic of below code

Asked by VANDANA GUPTA

### VANDANA GUPTA (view profile)

on 27 Jun 2019
Latest activity Commented on by Jan

### Jan (view profile)

on 8 Jul 2019
Xb=Xm; Yb=Ym; Zb=Zm; % Boundary Points
Xf=[];Yf=[];Zf=[];
for z=min(Zb):1:max(Zb)+0.5
x1=Xb(abs(Zb-z)<0.01);y1=Yb(abs(Zb-z)<0.01);z1=Zb(abs(Zb-z)<0.01);
for y=min(y1):1:max(y1)+0.5
x2=x1(abs(y1-y)<0.01);y2=y1(abs(y1-y)<0.01);z2=z1(abs(y1-y)<0.01);
xf=x2(abs(x2-min(x2))<0.01); yf=y2(abs(x2-min(x2))<0.01);zf=z2(abs(x2-min(x2))<0.01);
Xf=[Xf;xf];Yf=[Yf;yf];Zf=[Zf;zf];
end
end
range of Xb = 12.75 to 26.75
range of Yb = -10 to 10
range of Zb = -10 to 10

VANDANA GUPTA

### VANDANA GUPTA (view profile)

on 1 Jul 2019
sir this is the full code...
VANDANA GUPTA

### VANDANA GUPTA (view profile)

on 1 Jul 2019
sir, i want to understand this portion of this code:
% find the points in the front surface
for z=min(Zb):1:max(Zb)+0.5
x1=Xb(abs(Zb-z)<0.01);
y1=Yb(abs(Zb-z)<0.01);
z1=Zb(abs(Zb-z)<0.01);
for y=min(y1):1:max(y1)+0.5
x2=x1(abs(y1-y)<0.01);
y2=y1(abs(y1-y)<0.01);
z2=z1(abs(y1-y)<0.01);
xf=x2(abs(x2-min(x2))<0.01);
yf=y2(abs(x2-min(x2))<0.01);
zf=z2(abs(x2-min(x2))<0.01);
Xf=[Xf; xf]; Yf=[Yf; yf]; Zf=[Zf; zf];
end
end
Guillaume

### Guillaume (view profile)

on 1 Jul 2019
It calculates some stuff. Now, since you still haven't told us what the overall purpose of the code is, I doubt anybody is going to bother looking any deeper. Well written code would have comment explaining what the variables are (and have better variable names) and comments explaining what's going on. This hasn't
I suggest that if you need help understanding the code, you ask whoever wrote it.
Oh, and please use the toolbar to format the code as code. It's the button.

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## 1 Answer

Answer by Jan

### Jan (view profile)

on 1 Jul 2019

Start with a simplification of the code to make it easier to read:
% find the points in the front surface
for z = min(Zb):max(Zb) + 0.5
% Get x, y, z values of points near to Zb==z:
index = (abs(Zb - z) < 0.01);
x1 = Xb(index);
y1 = Yb(index);
z1 = Zb(index);
for y = min(y1):max(y1) + 0.5
% Get x1, y1, z1 values of points near to y1==y:
index = (abs(y1-y) < 0.01);
x2 = x1(index);
y2 = y1(index);
z2 = z1(index);
% Get x2, y2, z2 values of points near to y2==min(x2):
index = (abs(x2-min(x2)) < 0.01);
xf = x2(index);
yf = y2(index);
zf = z2(index);
% Collect the xf, yf, zf values:
Xf = [Xf; xf];
Yf = [Yf; yf];
Zf = [Zf; zf];
end
end

VANDANA GUPTA

### VANDANA GUPTA (view profile)

on 8 Jul 2019
ok, sir.......sir in the code of front surface, is vector size reduced of Xb,Yb and Zb upto x2, y2 and z2....and in xf, yf and zf, surface is getting
Jan

### Jan (view profile)

on 8 Jul 2019
@VANDANA GUPTA: So do you have a specific question about the code?

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