part 2

pagan — Mon, 30 Jan 2012 09:45:15 Z

To try and address your second question, about Explore, please compare the following two examples

Explore( plot(a*sin(x),x=0..2*Pi) );

Explore( plot(a*sin(x),x=0..2*Pi, view=[0..2*Pi, -10..10]) );

The second example forces the view and keeps it fixed, while the first example allows the view to "float" and change while matching the computed range. You may want the second approach.

part 1

pagan — Mon, 30 Jan 2012 10:20:45 Z

Regarding your first question, are you talking about 2D plots, such as x vs y=f(x)? If so then I am not aware of any recent functionality changes which make inverting the y-axis direction any easier.

One question that has been asked here a few times [1, 2, and 3] before is how to reverse the direction of just the positive section of the y-axis. That is: zero at top, and some finite value at the intercection with the x-axis. This might be the same as what you are asking now.

One answer (which can be seen via those links) is to use the `reflect` command while overriding the tickmarks.

Another possibility is to fake the 2D plot using a 3D plot, and then using the `orientation` option. For example, these can look somewhat similar:

plots:-display(plot(-x^2,x=0..4),
               axes=box,ytickmarks=[seq(-i=i,i=0..16,2)]);

plots:-display(plottools:-reflect(plot(x^2,x=0..4), [[0,0],[1,0]]),
               axes=box,ytickmarks=[seq(-i=i,i=0..16,2)]);

plot3d(x^2,x=0..4,y=0..0,orientation=[-180,-90,90],
       labels=[x,``,y],axes=box,view=[0..4,0..0,0..16]);

MaplePrimes - answers and comments on Question, Axis re-orientation and fixation

part 2

part 1