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To merge three FFT spectrum graphs in MATLAB, you can use the "hold on" command to plot all three graphs on the same figure. Then, use the "legend" command to add a legend to the graph, labeling each graph accordingly. Finally, use the "grid" command to add grid lines for better visualization.
Yes, you can merge FFT spectrum graphs with different sampling rates. However, it is important to note that the sampling rates should be compatible with each other. This means that the sampling rates should be related by an integer factor for the graphs to be merged accurately. You can use the "resample" command in MATLAB to adjust the sampling rates if needed.
To change the color or line style of the merged FFT spectrum graph, you can use the "plot" command with the desired color or line style as an input argument. For example, "plot(x, y, 'r--')" will plot the graph with a red dashed line. You can also use the "set" command to change the properties of the graph after it has been plotted.
You can add labels to the x and y axes of the merged FFT spectrum graph using the "xlabel" and "ylabel" commands in MATLAB. Simply use these commands with the desired label as an input argument. Additionally, you can use the "title" command to add a title to the graph.
Yes, you can save the merged FFT spectrum graph as an image file using the "saveas" command in MATLAB. This command allows you to save the graph in various file formats, such as PNG, JPG, and PDF. You can also specify the desired file name and location for the saved image.