add a marker to a plot at a specific point and include it in the legend in matlab

To add a marker to a specific point on a plot and include it in the legend in Matlab, you can use the plot function in combination with the hold on command and the legend function. Here's an example code:

main.m
x = 1:10;
y = x.^2;

plot(x, y);
hold on;
plot(x(5), y(5), 'o', 'MarkerFaceColor', 'red');
legend('y = x^2', 'Marker at x=5, y=25');
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In the code above, we first generate some data for x and y and then create a basic plot of y against x using the plot function. We then use hold on to prevent the current plot from being overwritten.

Next, we use the plot function again to add a marker at the fifth point in the x and y vectors, which has coordinates (5, 25). The o argument specifies the shape of the marker (in this case, a circle), while MarkerFaceColor sets the color of the marker.

Finally, we use the legend function to create a legend for the plot. We pass two strings as arguments, the first specifying the label for the main plot, and the second specifying the label for the marker we added. The legend will automatically include the marker's style and color.

Note that you can customize the appearance of the marker and the legend further by specifying additional arguments to the plot and legend functions, respectively.