![]() ![]() Warning: Error creating or updating LineStrip So, for example, let’s modify the middle (30%-transparent) red line to something more colorful: (the data values themselves are kept as a 3xN matrix of single values in Edge.VertexData). Then we can modify Edge.ColorData from being a 4×1 array of uint8 (value of 255 corresponding to a color value of 1.0), to being a 4xN matrix, where N is the number of data points specified for the line, such that each data point along the line will get its own unique RGB or RGBA value. The tricky part is to change the Edge.ColorBinding value from its default value of ‘object’ to ‘interpolated’ (there are also ‘discrete’ and ‘none’). If anyone finds a documented reference anywhere, please let me know – perhaps I simply missed it. In some rare cases (e.g., for patch objects) Matlab has separate Alpha properties that are fully documented, but in any case nowhere have I seen documented that we can directly set the alpha value in the color property, especially for objects (such as plot lines) that do not officially support transparency. This Alpha element is not documented anywhere as being acceptable, but appears to be supported almost universally in HG2 wherever a color element can be specified. So, for example, means a 70%-transparent red. In other words, color in HG2 can still be specified as an RGB triplet (e.g., to symbolize bright red), but also via a 4-element quadruplet RGBA, where the 4th element (Alpha) signifies the opacity level (0.0=fully transparent, 0.5=semi-transparent, 1.0=opaque). alpha(0.In the past few weeks, I discussed the new HG2 axes Backdrop and Baseline properties with their associated ability to specify the transparency level using a fourth (undocumented) element in their Color. You can adjust the transparency with the alpha function. ![]() We can select a pre-set lighting algorithm which is good for curved surfaces. % Put a point to indicate where the light source is (for reference) Alternatively, you can also use camlight. You can place a light source at a particular location. You can control the shading of surface objects using the shading function. You can change colormaps either interactively: The default colormap for a figure is JET. It is represented by an M-by-3 matrix, where each row represents a color (in RGB). To see what the current colormap is for the current figure, use the command colormap: colormap It exists in all MATLAB graphics, but you see the effect of it mostly in 3D surfaces and images. ColormapsĬolormaps are MATLAB's way of mapping levels/intensities/values to colors. In fact, there are a number of cam* commands for manipulating the view camera. camorbit(180, 0) % 180 degrees about Z-axis view(50, 40) % azimuth and elevationĪnother way of changing the view is to use commands like camorbit. You can do it interactively from the figure window:īut you can also do it programmatically using the view command. In a 3D plot, you can change the orientation of the view. Let's first focus on the three different types of 3D plots:įor the rest of the tutorial, we'll take a look at each of these topics in detail. MATLAB's 3D plotting capability is just as versatile as the 2D plots. Legend( 'Signal', 'Location', 'Northwest') 'MarkerSize', 10) Īdding titles, labels, legends is as simple as using the commands title, xlabel, ylabel, legend. In the next section, we'll talk more about these properties. In fact, you have much more control by providing specific "properties" to the command. ![]() Just highlight a variable that you want to plot and click on the drop down menu to bring up the Plot Selector.Īs with many other MATLAB functions, plot takes additional arguments allowing you to customize the plot. You can also access these functions directly from the Workspace Browser. Use PLOT for single color, single marker size scatter plots. H = SCATTER(.) returns handles to the scatter objects created. SCATTER(AX.) plots into AX instead of GCA. SCATTER(.,M) uses the marker M instead of 'o'. SCATTER(X,Y,S) draws the markers at the specified sizes (S) SCATTER(X,Y) draws the markers in the default size and color. ![]() Length(X)-by-3 matrix, it directly specifies the colors of the Same length as X and Y, the values in C are linearly mapped If S is empty, theĬ determines the colors of the markers. MATLAB draws all the markers the same size. Vector the same length a X and Y or a scalar. S determines the area of each marker (in points^2). SCATTER(X,Y,S,C) displays colored circles at the locations specifiedīy the vectors X and Y (which must be the same size). To learn how to use these functions, use help or doc help scatter % doc scatter SCATTER Scatter/bubble plot. Here's a good summary of these plotting routines. MATLAB provides a variety of plotting routines, both in 2D and 3D. ![]()
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