MaplePrimes - answers and comments on Question, why has the plot command deteriorated

Good question!

Preben Alsholm — Thu, 17 Jan 2013 04:56:15 Z

I tried the following in Maple 16 (no problem in Maple 15):

restart;
u:=sqrt(75-3*x^2);
plot(u); #No graph shown
dt:=plottools:-getdata(%);
M:=dt[-1];
M[1..10,1..2]; #OK data
M[-10..-1,1..2]; #Last data point undefined
M1:=M[1..-2,1..2]; #Last data point removed
plot(M1); #OK
plot(M); #No curve
plot(u,smartview=false); #Doesn't help
plot(u,style=point); #Works!
plot(u,x=-6..6); #No graph
plot(u,x=-5..5); #OK

I also tried:

plot(x^(-1/3)); #As expected and as in previous versions
dt:=plottools:-getdata(%);
M:=dt[-1];
has(M,HFloat(undefined)); #Answer 'false'
#The same question about the M above was 'true'.

Second question ("related issue")

Adri van der Meer — Thu, 17 Jan 2013 05:50:34 Z

plot( x^3, x=-8..8, y=-10..10 );

plot( x^3, view=[-8..8, -10..10] );

In the first way the label "y" is used for the vertical axis, in the second way there is no label.

Plot regression update

cskoog — Thu, 07 Feb 2013 00:31:21 Z

The plotting regression bug may be fixed using the mathdoc.jar update posted here:

http://www.mapleprimes.com/questions/143131-DEPlot-Error-When-Plotting-Solution-Curve?submit=143189#comment143189

Maple 16 Update

tkemp — Tue, 16 Apr 2013 23:58:05 Z

Maplesoft has released an update to Maple 16.02 that addresses plotting issues like the one described here. If you find yourself experiencing a similar problem, it would be a good idea to have a look at the webpage below for information on upgrading to Maple 16.02a which should fix plotting issues like the one described in this post.

http://www.maplesoft.com/support/downloads/m16_02a_update.aspx

funny workaround

Alejandro Jakubi — Thu, 17 Jan 2013 06:53:07 Z

I have run exactly your code in Maple 16.02 Standard GUI with plot output set inline. Indeed, I get plots with curves shown or not as you say. Then, I have saved this worksheet to a Classic worksheet format (mws), accepted at the warnings about missing features, and then opened this worksheet with Maple 16.02 Classic GUI. Interestingly, all the curves are shown (no need of a rerun). So, the stuff is there but not shown...It sounds like a regression bug in the Standard GUI plot driver.

pan

acer — Thu, 17 Jan 2013 07:04:01 Z

What happens if you pan the plot around a little? I can get the curve to appear, if I just do that in the Maple 16.02 Std GUI.

Also, the plot data structure generated in Maple 16.02 renders ok, as is, in Maple 15.01.

I agree with Alejandro, it seems like a Std GUI plot renderer problem.

I don't have a copy of Maple 16.00 or Maple 16.01 around, to see if either of those has the problem.

(This may be another report of the problem.)

acer