ERROR message when running code

The following command only plots the first subplot and gives the ERROR message:

Error in subplot (line 8)

subplot(3,1,1);

and this is the code below:

clear all

clc

x = 0 : pi/150 : 2*pi;

y1 = sin(x);

y2 = sin(x-0.25);

y3 = sin(x-0.5);

subplot(3,1,1);

plot(x, y1, 'r')

subplot(3,1,2);

plot(x, y2, 'g')

subplot(3,1,3);

plot(x, y3, 'b')

grid off

xlabel('Time (sec)');

ylabel('Amp (v)');

title('Signal xt');

legend('y1', 'y2', 'y3');

[Adam Danz]

The code works fine for me, without error. The only problem I see is the legend() does not specify object handles and therefore only shows one of the three lines.

Please copy-paste the entire error message and tell us what version of matlab you're running. Run 'ver' (without quotes).

[Amr Mousa]

My friend, I have a problem with "subplot" itself.

look, I tried to get the figure for one "subplot" as shown below and the problem still appears.

Code::

clear

clc

x = 0:pi/150:5;

y = sin(5*x);

subplot(1, 1, 1);

plot(x, y, 'r');

and I still have such an error

Attempt to execute SCRIPT subplot as a function:

subplot(1, 1, 1);

Answer 1

[Star Strider]

Your code plots all three variables. Note that they only differ by phase, so the easiest way to detect the difference is where they begin at ‘x=0’.

The error is not an error. It is a Warning, because you are plotting one variable and the legend specifies three variables. You either need to use a separate legend call in every subplot, or instead use the title function with each subplot.

EDIT —

In your Comment you mention the error is:

‘Attempt to execute SCRIPT subplot as a function:’

You have a script that you named ‘subplot’. This is called ‘overshadowing’ a MATLAB function. Please do not do that!

The solution is to re-name your script to something that does not have the same name as a MATLAB function. For example rename it to ‘mySubplot.m’ or something similar that makes sense in the context of your code.

[Adam Danz]

+1

@ Amr Mousa, this should address all of your questions.