MATLAB: Number coding the plot beside color coding

number codingplot

Hi all,

I am looking for a way to insert number coding of both the legend and the curves of the a graph with plot command. like attached figure ( I added numbers manually) do you know any way to do that. thanks for your time and help. number_coding plot.png

Best Answer

It is likely not possible to do exactly that, however you can come close.

Try this:

x = [1 10 14 17];
y = randi([-40 -11], 4, 6);
figure
plot(x, y, '.-')
text(ones(1, size(y,2)), y(1,:), compose('%d', 1:size(y,2)))
lgndc = compose('%d Curve %d', (1:size(y,2)).'*[1 1]);
legend(lgndc, 'Location','SW')
ylim([-45 max(ylim)])

You will need to produce your own version of ‘lgndc’. Just precede each entry by the number of the curve.

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To add the legend, either use sprintfc (undocumented although quite useful):

lgndc = sprintfc('IC = %.1f',conds);
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or compose:

lgndc = compose('IC = %.1f',conds);
legend(lgndc, 'Location','E')

both produce the same result.

Put these lines after your ‘grid on’ call.

MATLAB: How do you use Euler’s Method to approximate the solution

Euler's method approximates the area under a curve by using rectangular segments. The figure illustrates this process:

You specify the curve, in this case (dY/dT), and pick a starting value (Y0) and a step size, h. (Note that in this figure Y0 = 0)

Starting with the initial value, Y0, the next value is obtained by adding the rectangular area defined by (dY/dT) at T=0, and h.

This process is repeated at each step in h.

The illustration uses a large value of h to illustrate the process. The more rectangles you use (i.e. as h becomes smaller) the smaller the error becomes, so you want to use a large number of rectangles (a small value for h).

Best Answer

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MATLAB: How to add a legend to the plot

MATLAB: How do you use Euler’s Method to approximate the solution

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