Labelling of x axis

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Telema Harry 2021-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/844455-labelling-of-x-axis

评论： Telema Harry 2021-6-9

采纳的回答： Constantino Carlos Reyes-Aldasoro

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?

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Mathieu NOE 2021-5-31

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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 2021-6-9

编辑：Telema Harry 2021-6-9

Thank you for the feedback.

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Answer 1

Constantino Carlos Reyes-Aldasoro 2021-5-31

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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'}
>> 