вЂњBвЂќ or вЂњFвЂќ) for each of its four components. using the boundaryNodes function.How To Change Matlab Plot Background Color A Matlab Plot is a graphical representation of a plot line, or a set of plots of a line. Plot(nodes(newNodesBd,1), nodes(newNodesBd,2), 'rs') Д¬ompute the number of nodes in the boundary of the meshTwoHolesQuad.m example. % % You can substract some of the boundary node sets % using the *setdiff* Matlab function % Plot(nodes(indNodBd,1), nodes(indNodBd,2), 'rs') % show the elements and nodes at the boundaryДЇill(nodes(elem(indElemBd(i),:),1),nodes(elem(indElemBd(i),:),2), 'y') = boundaryNodes(nodes, elem) ДЇprintf( ' number of Boundary nodes = %d ',length(indNodBd)) ДЇprintf( ' number of Boundary elements = %d ',length(indElemBd)) We have also a function to obtain all the boundary nodes and elements. Use the Matlab function unique to erase repeated nodes in the global indexBoundary vector. IndexLeft: 10, indexRight:17, indexTop: 9, indexBottom: 9, indexCircle: 11 You must obtain the following number of nodes: Make different selection for the left, rigth, top, botton and circle segment boundaries and build an indexBoundary vector using all of them. Plot(nodes(indexLeft,1),nodes(indexLeft,2), 'mo')Д¬ompute the index set for all points in the boundary of the meshHole example.

Instead of using =0, we introduce a small tolerance (better when using floats) =find(nodes(:,1)<0.01) %index are the node numbers The sintax is:Д®xample: Select the left boundary nodes according their x-coordinate. It allow us to recover the indices (row and column) of a table that meets a condition. Plot the quadrangular mesh meshTwoHolesQuad.m using the above function.ДЇrom the nodes of a mesh, we can select different set of points from a mathematical equation or condition. PlotContourSolution(nodes,elem,Temp,titol,colorScale) % We will use our own function for plotting a colored mesh % it can plot both triangular and quadrangular meshes. Temp=1:numNodes %temperature for node i is assigned as T(i)=i % Just as an example we gave a temperature value for each node We have build a general function plotContourSolution.m in this case.Д¬onsider the triangle mesh in meshHole.m and assign a value of temperature for each node (like in one of our previous practices).

$plot color matlab$

Using the previous approach one can represent the color interpolation of each triangle in a triangle mesh. Use also colormap('gray') to obtain a gray color image

Use the same value for all nodes and you will get a flat color triangle Plot(p(1,1),p(1,2), 'ko') %plot the point using a black o Values= %can be temperature, stress, etc.Д¬olormap( 'jet') %one of the standar color maps for FEMД¬olorbar %it is optional, shows the bar with the color scale nodes=[1,1 %define the nodes of a triangleД®lem= %define the triangle it self as an element Using the FILL function a color representation is obtained where each point on the triangle has an interpolated color computed from the vertices values and the colormap. Let's see an exemple considering only one element: We consider a simple example where a Triangle is defined by its nodes and a numerical value is associated to each node. It consist of a table of 64 RGB different colors associated from the maximum value (red) to the minimum one (blue). When only one value is associated to each point, Matlab offers the possibility of chossing a color scale named colormap ( jet by default). Green: 0 <= g <= 255 (integer) or 0.0 <= g <= 1.0 (float) is the second channel Д«lue: 0 <= b <= 255 (integer) or 0.0 <= b <= 1.0 (float) is the third channel Д¬olor in Matlab can be specified using RGB but it also uses colormap which is an array of colors according to certain rules (jet, gray, copper, etc.) (see doc colormap in Matlab for more information) Red: 0 <= r <= 255 (integer) or 0.0 <= r <= 1.0 (float) is the first channel The main function is FILL.Д¬olor in general is defined as a triplet RGB values Matlab allow us to plot the results on the nodes of one element using color interpolation.

Selection of a set of points: Boundaries.

Plot color matlab