DJ Clayworth2

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18 years, 71 days

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The change in behaviour of plots[densityplot] was intentional in Maple 11. The purpose of densityplot is to draw a continuous function where the function's value maps to a color. Maple 10 did not do that very well, and it could usually be fixed only by setting a very high number of gridpoints. The Maple 11 behaviour gives a much better approximation, and with fewer gridpoints. densityplot was never really useful for discontinuous functions, except in rare cases where the discontinuity ran exactly along a line parallel to the x or y axis, and happened to coincide with a line of sample points. For example if you plot the function above in Maple 10 you will see a staircase effect along the boundary - not something that appears in the function. If you want to make plots where different regions have different values then I suggest using plots[inequal]. For the above function plots[inequal](x lessthan y, x = 0 .. 2, y = 0 .. 2); gives you what you probably want (with come color adjustment). (replace 'lessthan' with the appropriate symbol until I work out how to get it into this post) David Clayworth Maplesoft GUI Developer
It seems from a little experimenting that the results depend on what you have done before in the worksheet. I strongly recommend contacting Maplesoft Technical Support who will investigate this further. Here is the web page where you can do that. http://www.maplesoft.com/support/ David Clayworth Maplesoft GUI Developer
It seems from a little experimenting that the results depend on what you have done before in the worksheet. I strongly recommend contacting Maplesoft Technical Support who will investigate this further. Here is the web page where you can do that. http://www.maplesoft.com/support/ David Clayworth Maplesoft GUI Developer
All of the new plot features are supported for all the common export formats (Postscript, GIF, BMP, JPEG and WMF) as long as you are working in the Standard GUI. You can export using the context menus or set the plotdriver. The plot facilities in Classic and cmaple have not been updated. We at Maplesoft are very happy to meet your Gold Standard! David Clayworth Maplesoft GUI Developer
All of the new plot features are supported for all the common export formats (Postscript, GIF, BMP, JPEG and WMF) as long as you are working in the Standard GUI. You can export using the context menus or set the plotdriver. The plot facilities in Classic and cmaple have not been updated. We at Maplesoft are very happy to meet your Gold Standard! David Clayworth Maplesoft GUI Developer
When you say that you find Maple 10 slow on your machine, do you mean in general or only plotting? If it's plotting, there have been substantial speedups in 2D plots in Maple 11. David Clayworth Maplesoft GUI Developer
When you say that you find Maple 10 slow on your machine, do you mean in general or only plotting? If it's plotting, there have been substantial speedups in 2D plots in Maple 11. David Clayworth Maplesoft GUI Developer
Dear Dr. Lopez-Richard Your plot consists almost entirely of shaded polygons: i.e. where the colour varies across the polygon. The on-screen renderer draws this correctly, but plotdevice=ps cannot, largely because of the way postscript works. Instead it draws each polygon in a single colour, averaging the colour extremes. This accounts for what appears to be a lack of accuracy. When you export to BMP and similar formats from the screen it writes a bit-for-bit copy of what is on the screen, and you get the appearence of the shaded polygons and what looks like greater accuracy. You will probably get better results by using a bitmap format rather than postscript, (possibly converting the bitmaps back to postscript if you have the capability) or by using the exports from the Standard worksheet. I'm afraid there are no settings that will change the way plotdevice=ps works. You might also like to talk to Maplesoft technical support about any improvements that have been made in Maple 11 when it has been officially released. David Clayworth Maplesoft GUI Developer
Dear Dr. Lopez-Richard Your plot consists almost entirely of shaded polygons: i.e. where the colour varies across the polygon. The on-screen renderer draws this correctly, but plotdevice=ps cannot, largely because of the way postscript works. Instead it draws each polygon in a single colour, averaging the colour extremes. This accounts for what appears to be a lack of accuracy. When you export to BMP and similar formats from the screen it writes a bit-for-bit copy of what is on the screen, and you get the appearence of the shaded polygons and what looks like greater accuracy. You will probably get better results by using a bitmap format rather than postscript, (possibly converting the bitmaps back to postscript if you have the capability) or by using the exports from the Standard worksheet. I'm afraid there are no settings that will change the way plotdevice=ps works. You might also like to talk to Maplesoft technical support about any improvements that have been made in Maple 11 when it has been officially released. David Clayworth Maplesoft GUI Developer
1) To draw a filled open circle use the command plottools[pieslice], which works similarly to plottools[arc]. 2) The radius of the point cannot unfortunately be changed. Allowing filled symbols will be considered for implementation in a future release of Maple. David Clayworth Maplesoft GUI Developer
1) To draw a filled open circle use the command plottools[pieslice], which works similarly to plottools[arc]. 2) The radius of the point cannot unfortunately be changed. Allowing filled symbols will be considered for implementation in a future release of Maple. David Clayworth Maplesoft GUI Developer
The correct option is "linestyle=DASH". David Clayworth Maplesoft GUI Developer
Yes they do. David Clayworth Maplesoft GUI Developer
The coordinate readout is only intended to be approximate. It works based on the pixel position of the mouse, so there is a fundamental limit on how accurate it can be. Zooming the plot will improve that accuracy but then you come up against another limit, that the curve was generated using a set of point samples chosen based on the expected scale of the plot. So as you zoom in the accuracy of the lines does not increase. The preferred way is to use the power of Maple's math manipulation to get the values of the function you are plotting for any given x value. That should give you a point at which to place your arrow. David Clayworth Maplesoft GUI Developer
The coordinate readout is only intended to be approximate. It works based on the pixel position of the mouse, so there is a fundamental limit on how accurate it can be. Zooming the plot will improve that accuracy but then you come up against another limit, that the curve was generated using a set of point samples chosen based on the expected scale of the plot. So as you zoom in the accuracy of the lines does not increase. The preferred way is to use the power of Maple's math manipulation to get the values of the function you are plotting for any given x value. That should give you a point at which to place your arrow. David Clayworth Maplesoft GUI Developer
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