Re: [opendx-users] How to exclude part of data
another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are Try the Statistics control, it provides you, among other things, with the maximum and minimum value. Dragos -- signature.asc Description: Digital signature
Re: [opendx-users] How to exclude part of data
Using only the Colormap Editor (once you install Colormap and a Color, double-click the Colormap module), you can modify the normally linear colormap to any shape you want. You can also type in min and max values right there to constrain what gets colored (it invalidates the data outside your range, just like Include). So you can pretty quickly trim outliers, or leave them in, but by adding new control points, make a colormap that pushes all the colors down and up to wrap around the 'good' data. Note the 'histogram' function of Colormap Editor can help identify where the 'good' data is. To see all the above, you have to run the data flow from your imported field into the 1st input of Colormap. Also run this same output to the 1st input of Color. Then run the 1st output of Colormap to 2nd input of Color. Samples show this clearly. On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote: x-tad-biggerI am importing 2 3D dx files into my .net program. One of them contains pressure values in the ‘data’ field. The other shape file has only ‘positions’ and triangular ‘connections’ fields with no data. The pressure values within the shape are garbage and I need to make my program ignore them. The problem is that outside of the shape the pressures are all pretty close but inside they are really high and really low. As a result of this my colour map does not show the pressure differences outside the shape. I can manually set the max and min values through the ‘include’ function but dx is automatically called from another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are inside the shape. If I could do that I can set those values in the ‘include’ function and everything will display properly./x-tad-bigger x-tad-bigger /x-tad-bigger x-tad-biggerThanks,/x-tad-bigger x-tad-biggerJon/x-tad-bigger ___ Chris Pelkie Scientific Visualization Producer 622 Rhodes Hall, Cornell Theory Center Ithaca, NY 14853 (607) 254-8794
Re: [opendx-users] How to exclude part of data
I can get a good image that way but I am looking for a way to do this automatically. I am using it for a computational fluid dynamics simulation so the pressure range is always different depending on the shape and other parameters. Also, my cfd program calls dx once it writes the dx files so the user can immediately see the image. Because the pressure range depends on the individual problem you'd have to specify the range each time which is not very practical. My range is so big now that the good data (data outside the shape surface) appears all one colour because it occupies a very small range of the colourmap. If I use 'statistics' to find the max and min it gives me the garbage values from within the shape. I need to somehow use the boundary of the shape dx file to exclude the data inside of it and then search for the max and min outside. I can't find a way to split up the 'data' or get rid of part of it. I can exclude all of it easily enough but that's certainly no help. Thanks, Jon Chris Pelkie wrote: Using only the Colormap Editor (once you install Colormap and a Color, double-click the Colormap module), you can modify the normally linear colormap to any shape you want. You can also type in min and max values right there to constrain what gets colored (it invalidates the data outside your range, just like Include). So you can pretty quickly trim outliers, or leave them in, but by adding new control points, make a colormap that pushes all the colors down and up to wrap around the 'good' data. Note the 'histogram' function of Colormap Editor can help identify where the 'good' data is. To see all the above, you have to run the data flow from your imported field into the 1st input of Colormap. Also run this same output to the 1st input of Color. Then run the 1st output of Colormap to 2nd input of Color. Samples show this clearly. On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote: I am importing 2 3D dx files into my .net program. One of them contains pressure values in the ‘data’ field. The other shape file has only ‘positions’ and triangular ‘connections’ fields with no data. The pressure values within the shape are garbage and I need to make my program ignore them. The problem is that outside of the shape the pressures are all pretty close but inside they are really high and really low. As a result of this my colour map does not show the pressure differences outside the shape. I can manually set the max and min values through the ‘include’ function but dx is automatically called from another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are inside the shape. If I could do that I can set those values in the ‘include’ function and everything will display properly. Thanks, Jon ___ Chris Pelkie Scientific Visualization Producer 622 Rhodes Hall, Cornell Theory Center Ithaca, NY 14853 (607) 254-8794
Re: [opendx-users] How to exclude part of data
You can run the data through Histogram, then run the histo through Include to keep only the bins that have at least N occurrences, then Statistics to get the min/max pressures. Then feed your original data through Include, using this min/max. Joel Jonathan Matheson wrote: I can get a good image that way but I am looking for a way to do this automatically. I am using it for a computational fluid dynamics simulation so the pressure range is always different depending on the shape and other parameters. Also, my cfd program calls dx once it writes the dx files so the user can immediately see the image. Because the pressure range depends on the individual problem you'd have to specify the range each time which is not very practical. My range is so big now that the good data (data outside the shape surface) appears all one colour because it occupies a very small range of the colourmap. If I use 'statistics' to find the max and min it gives me the garbage values from within the shape. I need to somehow use the boundary of the shape dx file to exclude the data inside of it and then search for the max and min outside. I can't find a way to split up the 'data' or get rid of part of it. I can exclude all of it easily enough but that's certainly no help. Thanks, Jon Chris Pelkie wrote: Using only the Colormap Editor (once you install Colormap and a Color, double-click the Colormap module), you can modify the normally linear colormap to any shape you want. You can also type in min and max values right there to constrain what gets colored (it invalidates the data outside your range, just like Include). So you can pretty quickly trim outliers, or leave them in, but by adding new control points, make a colormap that pushes all the colors down and up to wrap around the 'good' data. Note the 'histogram' function of Colormap Editor can help identify where the 'good' data is. To see all the above, you have to run the data flow from your imported field into the 1st input of Colormap. Also run this same output to the 1st input of Color. Then run the 1st output of Colormap to 2nd input of Color. Samples show this clearly. On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote: I am importing 2 3D dx files into my .net program. One of them contains pressure values in the ‘data’ field. The other shape file has only ‘positions’ and triangular ‘connections’ fields with no data. The pressure values within the shape are garbage and I need to make my program ignore them. The problem is that outside of the shape the pressures are all pretty close but inside they are really high and really low. As a result of this my colour map does not show the pressure differences outside the shape. I can manually set the max and min values through the ‘include’ function but dx is automatically called from another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are inside the shape. If I could do that I can set those values in the ‘include’ function and everything will display properly. Thanks, Jon ___ Chris Pelkie Scientific Visualization Producer 622 Rhodes Hall, Cornell Theory Center Ithaca, NY 14853 (607) 254-8794 -- === Joel Richardson, Ph.D. Phone: (207) 288-6435 The Jackson Laboratory Fax: (207) 288-6132 600 Main Street URL: www.informatics.jax.org Bar Harbor, Maine 04609 ===
Re: [opendx-users] How to exclude part of data
If that helps, in my CFD data, I almost allways use showboundary-Autocolor Then colormap includes only the range of what you see. Additionally you can do: ...-showboundary-statistics.. if you want to get min max of the values. If module showboundary doesn't work properly check your data structure (for example do not doublicate nodes etc). -- Jonathan Matheson wrote: I can get a good image that way but I am looking for a way to do this automatically. I am using it for a computational fluid dynamics simulation so the pressure range is always different depending on the shape and other parameters. Also, my cfd program calls dx once it writes the dx files so the user can immediately see the image. Because the pressure range depends on the individual problem you'd have to specify the range each time which is not very practical. My range is so big now that the good data (data outside the shape surface) appears all one colour because it occupies a very small range of the colourmap. If I use 'statistics' to find the max and min it gives me the garbage values from within the shape. I need to somehow use the boundary of the shape dx file to exclude the data inside of it and then search for the max and min outside. I can't find a way to split up the 'data' or get rid of part of it. I can exclude all of it easily enough but that's certainly no help. Thanks, Jon Chris Pelkie wrote: Using only the Colormap Editor (once you install Colormap and a Color, double-click the Colormap module), you can modify the normally linear colormap to any shape you want. You can also type in min and max values right there to constrain what gets colored (it invalidates the data outside your range, just like Include). So you can pretty quickly trim outliers, or leave them in, but by adding new control points, make a colormap that pushes all the colors down and up to wrap around the 'good' data. Note the 'histogram' function of Colormap Editor can help identify where the 'good' data is. To see all the above, you have to run the data flow from your imported field into the 1st input of Colormap. Also run this same output to the 1st input of Color. Then run the 1st output of Colormap to 2nd input of Color. Samples show this clearly. On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote: I am importing 2 3D dx files into my .net program. One of them contains pressure values in the ‘data’ field. The other shape file has only ‘positions’ and triangular ‘connections’ fields with no data. The pressure values within the shape are garbage and I need to make my program ignore them. The problem is that outside of the shape the pressures are all pretty close but inside they are really high and really low. As a result of this my colour map does not show the pressure differences outside the shape. I can manually set the max and min values through the ‘include’ function but dx is automatically called from another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are inside the shape. If I could do that I can set those values in the ‘include’ function and everything will display properly. Thanks, Jon ___ Chris Pelkie Scientific Visualization Producer 622 Rhodes Hall, Cornell Theory Center Ithaca, NY 14853 (607) 254-8794
Re: [opendx-users] How to exclude part of data
Thanks! That was just what I was looking for. Jon Joel Richardson wrote: You can run the data through Histogram, then run the histo through Include to keep only the bins that have at least N occurrences, then Statistics to get the min/max pressures. Then feed your original data through Include, using this min/max. Joel Jonathan Matheson wrote: I can get a good image that way but I am looking for a way to do this automatically. I am using it for a computational fluid dynamics simulation so the pressure range is always different depending on the shape and other parameters. Also, my cfd program calls dx once it writes the dx files so the user can immediately see the image. Because the pressure range depends on the individual problem you'd have to specify the range each time which is not very practical. My range is so big now that the good data (data outside the shape surface) appears all one colour because it occupies a very small range of the colourmap. If I use 'statistics' to find the max and min it gives me the garbage values from within the shape. I need to somehow use the boundary of the shape dx file to exclude the data inside of it and then search for the max and min outside. I can't find a way to split up the 'data' or get rid of part of it. I can exclude all of it easily enough but that's certainly no help. Thanks, Jon Chris Pelkie wrote: Using only the Colormap Editor (once you install Colormap and a Color, double-click the Colormap module), you can modify the normally linear colormap to any shape you want. You can also type in min and max values right there to constrain what gets colored (it invalidates the data outside your range, just like Include). So you can pretty quickly trim outliers, or leave them in, but by adding new control points, make a colormap that pushes all the colors down and up to wrap around the 'good' data. Note the 'histogram' function of Colormap Editor can help identify where the 'good' data is. To see all the above, you have to run the data flow from your imported field into the 1st input of Colormap. Also run this same output to the 1st input of Color. Then run the 1st output of Colormap to 2nd input of Color. Samples show this clearly. On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote: I am importing 2 3D dx files into my .net program. One of them contains pressure values in the ‘data’ field. The other shape file has only ‘positions’ and triangular ‘connections’ fields with no data. The pressure values within the shape are garbage and I need to make my program ignore them. The problem is that outside of the shape the pressures are all pretty close but inside they are really high and really low. As a result of this my colour map does not show the pressure differences outside the shape. I can manually set the max and min values through the ‘include’ function but dx is automatically called from another program and that is not an option. I am looking for a way to search for the max and min pressure values while ignoring those that are inside the shape. If I could do that I can set those values in the ‘include’ function and everything will display properly. Thanks, Jon ___ Chris Pelkie Scientific Visualization Producer 622 Rhodes Hall, Cornell Theory Center Ithaca, NY 14853 (607) 254-8794
