Labelling of x axis

Hello Programmers,

I have an hourly data and I used a step size of 0.1 in my simulation.

I used 12 hours worth of data in my simulation.

I will like the x-axis of my graph to be in hours stead of the number of points.

please how can I do that?

[Mathieu NOE]

hello

there's something missing in your question : step size of 0.1 : unit ? second ?

if you have the amount of samples and the sampling rate , it's fairly strightforward to compute the xaxis values in seconds / minutes or hours :

assuming a step size of 0.1 second :

dt = 0.1;
samples = length(data);
x_axis_hours = (0:samples-1)*dt/3600;
plot(x_axis_hours,data);

[Telema Harry]

Thank you for the feedback.

Answer 1

[Constantino Carlos Reyes-Aldasoro]

There are 2 ways to solve this:

First is to plot in the actual hours instead of the points of the matrix that is holding the data, so, say your values are stored every second, instead of plotting

plot(x,y)

you should plot

plot(x/3600,y)

and that would adjust the values of the x-axis.

The second way is to manipulate the values that are displayed on the x-axis, these are called the ticks and tick labels, for example:

>> plot(1:20,sin(1:20))
>> h1=gca;  %you are grabbing the handles of the axis 
>> h1.XTick
ans =
  Columns 1 through 7
     0     2     4     6     8    10    12
  Columns 8 through 11
    14    16    18    20
>> h1.XTickLabel
ans =
  11×1 cell array
    {'0' }
    {'2' }
    {'4' }
    {'6' }
    {'8' }
    {'10'}
    {'12'}
    {'14'}
    {'16'}
    {'18'}
    {'20'}
>> 

So you can change the values of XTickLabel. I would suggest to try the first method and see if that works.

Hope this solves your problem.

[Telema Harry]

Thank you.