Plotting xx and yy a cross on a point matlab answers. Notice that the titles and labels that you defined for the first plot are no longer in the current figure window. Plotting graph with given points matlab answers matlab. Let p1 and p2 be 1 x 3 row vectors of the x, y, z coordinates of two points. In matlab, ultimately every curve is approximated by straight lines or discretized into pixels.
How do i create a 3 dimensional surface from x y z points. Matlab extracting x and y coordinates matlab answers. To change the colormap for the axes, use the colormap function. Learn more about 2d plot graph image processing toolbox. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Tubeplot with xycoordinates and radius matlab answers. The problem is, when i try to plot them again in another script or in another figure the result is not what i expected. Plot expression or function matlab fplot mathworks. I wish to obtain the x and y coordinates of desired points on my graph. The code i use for plotting the points the second time is. You can plot multiple lines using the hold on command. Plotting values on specific xy coordinates matlab answers. I have points for my data and the equation above is the linear regression.
I would like to plot the precipitation values for each set of xy coordinates as a chart. Mathworks is the leading developer of mathematical computing software for. Stacked plot of several variables with common xaxis. The x axis scale ranges from 1 to the number of rows in y. The problem is, i cant seem to figure out a code to just take the x, y, and z coordinates and produce some kind of mesh grid or figure. Mar 15, 20 hi, i have x, y,z,t data in a excel file. Let us take one more example to plot the function y x 2. Now each of these 6 values have 2 confidence interval bounds for them. Apr 05, 2012 plotting xx and yy a cross on a point. Ydata are the x and y values of the data youre contouring, rather than the x, y position of the contour line.
By default, matlab clears the figure before each plotting command. Press the return key to stop before all n points are selected. If you have three points in the scatter plot and want the colors to be indices into the colormap, specify c as a threeelement column vector. If y is a vector, then the x axis scale ranges from 1 to length y. Until you use hold off or close the window, all plots appear in the current figure window. How to make points larger on plot matlab answers matlab. Let p1 and p2 be 1 x 3 row vectors of the x, y, z coordinates of two points along your line and let r be the desired radius. Assuming your treasure locations is x and y both can be a vector for multiple points, you can plot those using. How to create a smooth curve through data points learn more about plot, smooth line, curve. Include a marker symbol in the linespecification input argument, such as plot x, y,s. Matlab generates a vector, x, and fills it with a range of data points for you. The stackedplot function plots the values from the loss, customers, and restorationtime variables, with each variable plotted along its own yaxis.
Plotting matrix points matlab answers matlab central. Aug 05, 2015 basically we always plot graph of certain function such as x 0. Learn more about peaks, coordinate, plot, function, maximum matlab. In old matlab versions, i could extract x and y points along a contour line as shown below. Matlab tutorial function plotting basics plot multiple. I have then added a horizontal line to the plot at the y value where i want to find out the corresponding x values shown in red on the plot. How to display the coordinate of the point in the figure matlab. When using plot x, y function, say for example x 1x20 matrix and ysin x, which means that there are only 20 data points, matlab plot comes out to be a continuous one. Aug 17, 2014 tube plot with x y coordinates and radius. When using plotx,y function, say for example x 1x20 matrix and ysinx, which means that there are only 20 data points, matlab plot comes out to be a continuous one. Matlab has so many commands when it comes to plotting i dont even know where to start. Mathworks is the leading developer of mathematical computing software for engineers and scientists. I had just expected that only the points written in arrays x and y would be plotted,but the graph shows lines also. However, the plot does not include the region and cause variables because they contain data that cannot be plotted.
I have velocity, x position and y position data as 40,20 array having only few nonzero values. I have tried using polyfit, smoothingspline, pchip and other curvefitting tools, but all of them connect the wrong data points together, since this graph is actually x f y. Each row of k defines a triangle in terms of the point indices, and the triangles collectively form a bounding polyhedron. The length of edgelabel must be equal to the number of edges in the graph. Just after plotting the coordinates im indexing them in two different vectors one for x coordinates and the other for y coordinates. Documentation, the government hereby agrees that this software or documentation qualifies as commercial computer. Boundary of a set of points in 2d or 3d matlab boundary. For example if an x, y point occurs quite a bit then it will be dark red on the plot whereas a point that only occurs once will be light blue or something similar.
In ms excel, if i switch the axes so the curve becomes a onetoone function where y fx, i can easily fit a quadratic curve to the points. Jul 14, 2016 matlab tutorial function plotting basics plot multiple lines learn matlab in simple and easy steps starting from basic to advanced concepts with examples. Sep 18, 2017 dont create variable names like this in the first place. To plot all circles with the equal area, specify sz as a numeric scalar. However, i want to see all the 4 quadrants, how to. Dec 05, 2017 how to create a smooth curve through data points learn more about plot, smooth line, curve. Feb 27, 2016 i have two matrices x and y with 1x5 order. The data points begin at pi and end at pi, using 0. Threedimensional plots typically display a surface defined by a function in two variables, z f x, y.
I want to plot all of the points on the same graph. I want to plot the bounds as a cross passing through the point. Dont create variable names like this in the first place. Scatter plot by group matlab gscatter mathworks nordic. The row times, outagetime, provide the values along the x axis. Identify axes coordinates matlab ginput mathworks benelux. Matlab tutorial function plotting basics plot multiple lines learn matlab in simple and easy steps starting from basic to advanced concepts with examples. Use the xdata and ydata properties of the line object, fp, instead. The plot is formed by joining adjacent points with. For 3d problems, k is a triangulation matrix of size mtriby3, where mtri is the number of triangular facets on the boundary.
Continuous plotx,y for discrete data points matlab. The stackedplot function plots the values from the loss, customers, and restorationtime variables, with each variable plotted along its own y axis. As you can tell, it becomes hard to work with them downstream in your code. Now i need to plot the graph with one array as x axis and one array as y axis. To evaluate z, first create a set of x, y points over the domain of the function using meshgrid. I havent been able to determine the correct plot syntax to accomplish this.
For 2d problems, k is a column vector of point indices representing the sequence of points around the boundary, which is a polygon. If x and y are both vectors, then they must have equal length. Use the figure command to open a new figure window. I then want to have these points markedhighlighted on the graph. And join all these x,y coordinates to from a connected network graph.
In addition, it demonstrates that you dont even have to open any of the plotting tools to generate a plot in matlab. Matlab extracting x and y coordinates learn more about plot, excel, activex, plotting while in excel. Matlab graphics defines a surface by the zcoordinates of points above a rectangular grid in the xy plane. Axes objects defining coordinate systems for graphs 102. I have created an xy plot in matlab but i was wondering if there is a quick and easy way of extracting all x and y points so i can recreate the graph on excel. Specify the marker property as a namevalue pair, such as plot x, y,marker,s. From there, i copy the data to excel to transpose the columns into rows for matlab use. Ydata are the x and y values of the data youre contouring, rather than the x,y position of the contour line. In ms excel, if i switch the axes so the curve becomes a onetoone function where y f x, i can easily fit a quadratic curve to the points. Stacked plot of several variables with common xaxis matlab. In this example, we will draw two graphs with the same function, but in second time, we will reduce the value of increment.
Plot the displacement values on the xaxis and the horsepower values on the yaxis. Instead, rewrite your code to produce a single variable named x that has all of the x values, and another variable called y for the y values. I have plotted a graph based on known sets of data for x and y. I have a plot of x and y coordinates and i would like to plot them to show the intensity of the points. Here is the link about scatter3 function you can see examples also. I want to plot a simple graph with specific x,y coordinates. I am plotting x,y coordinates in a simple plot and the. If y is a matrix, then the plot function plots the columns of y versus their row number. The x matrix gives x coordinates and y matrix gives y coordinates for points in the plot. Finding x value with known y value on plot matlab answers. Finding x y coordinates from surface plot matlab answers. For a list of marker options, see supported marker symbols.
It looks like you need to read a basic tutorial on matlab first before you take on this project. How to 3d plot data points in matlab learn more about 3d plots, imported data. Apr 20, 2011 finding x y coordinates from surface plot. To add text to one point, specify x and y as scalars. Learn more about circle, radius, center, rectangle, overcoming obstacles matlab. I have a written a program which utimately plots a graph for me. I have velocity data that i want to plot for both x and y axes at the same time as these data are only available for few locations. Plot the displacement values on the x axis and the horsepower values on the y axis. To choose a point, move your cursor to the desired location and press either a mouse button or a key on the keyboard. I am plotting x,y coordinates in a simple plot and the plotted values lies in 1st quadrant. Fit a curve to data points x fy matlab answers matlab. Mathworks is the leading developer of mathematical computing software for engineers.
Each specification can include characters for the line color, style, and marker. Edge labels, specified as the commaseparated pair consisting of edgelabel and a numeric vector, cell array of character vectors, or string array. I have three lists of data listed in the workspace in tables that are 8000x1 that will be x, y, and z for the plot i want to make. Unlike the convex hull, the boundary can shrink towards the interior of the hull to envelop the points. Aug 12, 2014 i have created an xy plot in matlab but i was wondering if there is a quick and easy way of extracting all x and y points so i can recreate the graph on excel. How do i plot intensity of points on a scatter plot. Mathworks is the leading developer of mathematical computing software. The row times, outagetime, provide the values along the xaxis.
Plotting of velocity data points in xy graph matlab. Learn more about graph, plot, point, given pt matlab. If x and y are both matrices, then they must have equal size. I have tried using polyfit, smoothingspline, pchip and other curvefitting tools, but all of them connect the wrong data points together, since this graph is actually x fy. The plot function plots columns of y versus columns of x. Connecting points in graph matlab answers matlab central. In the workspace you have defined three variables, x, y, and z. By default edgelabel is an empty cell array no edge labels are displayed. I have x 181x361, y181x361, values181x361, i would like to plot the values on each x and y with colors indicating the values in a 2dplane. To add text to multiple points, specify x and y as vectors with equal length.
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