David, There is no such API--maybe we should add some methods to the base Colormap so there would be--but you can do it yourself in either of two ways.
First, you can generate a colormap from a list of colors, and the colors can be rgb triplets, so you could make your Nx3 array, do whatever you want with it, and then turn it into a colormap by using it to initialize a ListedColormap. (The ListedColormap accepts an Nx3 array, or a list of any valid mpl colorspecs.) Second, if you have any existing mpl Colormap instance, you can directly manipulate the _lut attribute; it is an ndarray and its dimensions are (N+3)x4. You might want to manipulate only the [:N,:3] subarray of it. The leading underscore means this attribute is not intended for user manipulation--but there is nothing to stop you from doing it in a pinch if necessary. Eric David Goldsmith wrote: > Hi. Making progress. Caveat for what follows: the last version of Matlab I > used was like 6 or 7, I think - it's been a little while - so for all I know, > the colormap manipulation API I've been able to discover in the current MPL > does correspond closely to the same thing in the current Matlab. That said, > said MPL colormap API is much more "powerful" (and consequently complicated) > than I need, at least for right now. :-) Is there a set of tools I'm not > finding, or perhaps a third-party add-on, that enables more Matlab-like > colormap manipulation? For example, I'm use to a (Matlab) colormap simply > being an Nx3 array of N RGB triples (or at least that's the API), which one > can then process using standard array operators (+, *, etc.), methods > (transpose, flipud, fliplr, etc), etc. and create and apply new colormaps by > simply saying "colormap = <new N x 3 array>" - are there tools which enable > this manner of manipulating MPL's colormap class instances? Or > a "built-in" API to these that I'm not finding? Thanks! > > DG > > PS: In case this is relevant, I'm using the OO API, not pylab. Thanks again. > > > > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
