## 295 Reputation

16 years, 183 days

## Image...

"Your images here all look like Chinese error messages"

Thanks for your kind reminder. Sorry  I didn't notice it. Yes my images are linked from a Chinese site. In my computer, I don't find any difference of your image and mine.
You mean that all the images I posted are unreadable?

I am now trying the way you suggested.

Tell me if these images/animations are OK now? Thank you.

## The following would...

The following would work:

```with(plots):
r:=sin(3*t):
K:=30: for i from 1 to K do ti:=i*2*Pi/K:
curve[i]:=polarplot(r(t), t=0..ti) od:
C:=display(seq(curve[i],i=1..K), insequence=true):
display(C, scaling=constrained,tickmarks=[0,0], thickness=3,insequence=true);
```

Yes, it works. Thank you.  Just use "insequence=true" twice.

## The following would...

The following would work:

```with(plots):
r:=sin(3*t):
K:=30: for i from 1 to K do ti:=i*2*Pi/K:
curve[i]:=polarplot(r(t), t=0..ti) od:
C:=display(seq(curve[i],i=1..K), insequence=true):
display(C, scaling=constrained,tickmarks=[0,0], thickness=3,insequence=true);
```

Yes, it works. Thank you.  Just use "insequence=true" twice.

## with(plots):with(plottools):...

with(plots):with(plottools):

f:=x->x: g:=x->x^2:

F:=spacecurve([x,f(x),0],x=-0.2..1.2,color=blue, thickness=3):

G:=spacecurve([x,g(x),0],x=-0.2..1.2,color=red, thickness=3):

region:=plot3d([x,y,0],x=0..1,y=g(x)..f(x),color=grey, style=patchnogrid):

FG:=display(region,F,G,axes=normal, scaling=constrained):

transform((x,y,z)->[x,y,0])(FG);

The above will produce the graph:

But the following do not work (I use Maple 8):

with(plots):with(plottools):
f:=x->x: g:=x->x^2:
F:=spacecurve([x,f(x),0],x=-0.2..1.2,color=blue, thickness=3):
G:=spacecurve([x,g(x),0],x=-0.2..1.2,color=red, thickness=3):
region:=plot3d([x,y,0],x=0..1,y=g(x)..f(x),color=grey, style=patchnogrid):
FG:=display(region,F,G,axes=normal, scaling=constrained):
transform((x,y,z)->[x,y])(FG);

Plotting error, vertex requires three components

Thanks for your suggestion on using "Transfom", which I didn't know before.

## Maybe you are using a new...

Maybe you are using a new version of Maple?

I use Maple 8.

## Maybe you are using a new...

Maybe you are using a new version of Maple?

I use Maple 8.

## But it doesn't...

But it doesn't work.

restart: with(plots):
animate(polarplot,[sin(3*t),t=0..x],x=0..Pi,thickness=3,frames=20);

Warning, the name changecoords has been redefined

Error, (in animate) bad range arguments: [sin(3*t), t = 0 .. x], x = 0 .. Pi

## But it doesn't...

But it doesn't work.

restart: with(plots):
animate(polarplot,[sin(3*t),t=0..x],x=0..Pi,thickness=3,frames=20);

Warning, the name changecoords has been redefined

Error, (in animate) bad range arguments: [sin(3*t), t = 0 .. x], x = 0 .. Pi

## Yes, it works. But what is...

Yes, it works.
But what is the difference between your codes and the first of mine?
Thanks

## Yes, it works. But what is...

Yes, it works.
But what is the difference between your codes and the first of mine?
Thanks

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