How to ginput in MATLAB?

Posted on by David Darling

How to ginput in MATLAB?

[ x , y ] = ginput( n ) allows you to identify the coordinates of n points within Cartesian, polar, or geographic axes. To choose a point, move your cursor to the desired location and press either a mouse button or a key on the keyboard. Press the Return key to stop before all n points are selected.

How do I enter coordinates in Matlab?

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  1. prompt = {‘x-coor:’,’y-coor:’};
  2. name = ‘Input coordinates’;
  3. numlines = 1;
  4. answer = inputdlg(prompt,name,numlines)
  5. points = [str2num(answer{1}); str2num(answer{2})]’;

How do I plot a specific point in Matlab?

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  1. hold on. plot(x_pos,y_pos,’r*’)
  2. plot(x,y) hold on. plot(x(10),y(10),’r*’) % marking the 10th data point of x and y.
  3. x = 0:0.1:pi; y = sin(x); p = plot(x,y,’o-‘,’MarkerIndices’,10)

How do you plot points in Matlab?

Create a line plot with 1,000 data points, add asterisks markers, and control the marker positions using the MarkerIndices property. Set the property to the indices of the data points where you want to display markers. Display a marker every tenth data point, starting with the first data point.

How do I plot data from Excel to MATLAB?

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  1. You can simply read data in an Excel file using the readtable function.
  2. Then, read the column data as X and Y variables into Matlab. ( Use the column header names in the Excel file to extract values. Please see the example below)
  3. Use the plot function to create a plot.

How do you plot data points?

Follow these simple steps:

  1. First, find the value for x on the x-axis.
  2. Next, find the y-value – in this case, y=1100, so find 1100 on the y-axis.
  3. Your point should be plotted at the intersection of x=0 and y=1100.
  4. Finally, plot the point on your graph at the appropriate spot.

How do you use Roipoly?

Use roipoly to select a polygonal region of interest within an image. roipoly returns a binary image that you can use as a mask for masked filtering. BW = roipoly(I,c,r) returns the region of interest selected by the polygon described by vectors c and r .

How do I read a .text file in MATLAB?

Use fopen to open the file, specify the character encoding, and obtain the fileID value. When you finish reading, close the file by calling fclose(fileID) . A = fscanf( fileID , formatSpec , sizeA ) reads file data into an array, A , with dimensions, sizeA , and positions the file pointer after the last value read.

How do I export MATLAB code to PDF?

How to Convert MATLAB to a PDF

  1. Click “Start,” “All Programs” and “MATLAB” to launch the program.
  2. Click the “File” button on the top left of the screen, then click “Open…”
  3. Select the MATLAB file you would like to convert to PDF.
  4. Click the “File” button, then click “Export…”

How do I write text in MATLAB?

To add text to one point, specify x and y as scalars. To add text to multiple points, specify x and y as vectors with equal length. text( x , y , z , txt ) positions the text in 3-D coordinates. text(___, Name,Value ) specifies Text object properties using one or more name-value pairs.