The legend of the plot doesn't appear

Hi,

I want to plot a signal with a title and legend. But the legend doesn't appear on the plot, wheareas the title do.

Can someone help me please ?

Answer 1

[madhan ravi]

https://www.mathworks.com/help/matlab/ref/legend.html#bu_szhx-1

[Lucas Veit]

I read this but don't find any answer.

Here is my code:

t = 20;
ech = 0.001;

k = 1;
for i = 0:ech:t
    y(k,:) = [i 3+sin(4*i)/5+cos(8*i)/9];
    k = k + 1;
end

plot(y(:,1),y(:,2));
legend("signal");

But the legend doesn't appear on the plot

[Lucas Veit]

Even when I am on the plot and I click on "insert legend" nothing happend

[madhan ravi]

>> which legend -all
/MATLAB/toolbox/matlab/scribe/legend.m

If you see anything other than the above, move it from the path or rename it.

[Lucas Veit]

I have exactly the same path

[madhan ravi]

Strange , try contacting the MathWorks support team for support.

[Lucas Veit]

thanks

Answer 2

[Image Analyst]

Works for me:

t = 20;
ech = 0.001;

k = 1;
for i = 0:ech:t
    y(k,:) = [i 3+sin(4*i)/5+cos(8*i)/9];
    k = k + 1;
end

plot(y(:,1),y(:,2));
legend("signal");

Except that I don't get a title on my plot using your very same code. I don't see how you got a title instead of a legend. Are you sure you're not confusing the legend (inside the box inside the plot) with a title?

Try, in the command window:

>> restoredefaultpath

and try again.

[Lucas Veit]

Finally I have found the problem. Yesterday I worked on a file but there was a mistake because of the legend of a plot, so the file "legend.m" opened and I changed something accidently. Now it workes again !