Matlab: Graph Plots
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This document discusses various plotting tools in Matlab, including: - The plot and stem functions for plotting data values against their index or specified x-values. - Tools for labeling axes, titles, legends, and setting axis properties. - The subplot function for dividing the figure window into multiple plots. - Examples of simple 2D function plots, stem plots, subplot usage, and a 3D surface plot.
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![Tools for plottinghold on / off - Normally hold is off. This means that the plot command replaces the current plot with the new one. To add a new plot to an existing graph use hold on. If you want to overwrite the current plot again, use hold off.legend('plot1','plot2',...,'plot N') - The legend command provides an easy way to identify individual plots when there are more than one per figure.axis([xminxmaxyminymax])- Use the axis command to set the axis as you wish.](https://image.slidesharecdn.com/graphplots-100110034747-phpapp01/85/Matlab-Graph-Plots-4-320.jpg)
![2-D plottingTo plot the function:y = x2 for x 2 [-2; 2].x = -2:0.2:2;](https://image.slidesharecdn.com/graphplots-100110034747-phpapp01/85/Matlab-Graph-Plots-7-320.jpg)
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- 2. Tools for plottingplot- plot(y) plots the values in vector y versus their index. plot(x,y) plots the values in vector y versus x. The plot function produces a piecewise linear graph between its data values. With enough data points it looks continuous.stem- Using stem(y) the data sequence y is plotted as stems from the x-axis terminated with circles for the data values. stem(x,y) plots the data sequence y at the values specified in x.
- 3. Tools for plottingxlabel('string') - Labels the x-axis with string.ylabel('string') - Labels the y-axis with string.title('string') - Gives the plot the title string.
- 4. Tools for plottinghold on / off - Normally hold is off. This means that the plot command replaces the current plot with the new one. To add a new plot to an existing graph use hold on. If you want to overwrite the current plot again, use hold off.legend('plot1','plot2',...,'plot N') - The legend command provides an easy way to identify individual plots when there are more than one per figure.axis([xminxmaxyminymax])- Use the axis command to set the axis as you wish.
- 5. Tools for plottingsubplot(m,n,p) -Divides the figure window into m rows, n columns and selects the pp'th subplot as the current plot, e.g subplot(2,1,1) divides the figure in two and selects the upper part. subplot(2,1,2) selects the lower part.grid on/off - This command adds or removes a rectangular grid to your plot.
- 6. Graph ComponentsThe following picture shows the basic components of a typical graph.
- 7. 2-D plottingTo plot the function:y = x2 for x 2 [-2; 2].x = -2:0.2:2;
- 8. y = x.^2;
- 9. figure(1);
- 10. plot(x,y);
- 11. xlabel('x');
- 12. ylabel('y=x^2');
- 14. figure(2);
- 15. stem(x,y);
- 16. xlabel('x');
- 17. ylabel('y=x^2');
- 18. title('Simple stem plot');2-D plottingx = -3:0.2:3; y1 = -x.^2; y2 = x.^2;
- 19. subplot(2,1,1);
- 20. plot(x,y1);
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- 23. subplot(2,1,2);
- 24. plot(x,y2);
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- 27. y = exp(sin(t));
- 29. xlabel('X Axis')
- 31. title('Two Y Axes')3-D Graphics[x,y] = meshgrid(-3:.1:3);
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