How to normalize output data for a plot

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Giovanni Ponce 2022-6-29

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评论： Giovanni Ponce 2022-7-13

Screen Shot 2022-06-29 at 1.02.06 AM.png

I want to normalize the the y-axis of a plot. The current limits for the graph are set from 0 to 30 on the y-axis, how would I normalize the output data of the simulink model being 'sim_data.Pd'? Could it be possible to use the Normalize function for this?

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Jonas 2022-6-29

what do you mean with Normalization? You want values only between 0 and 1? You want to see in the plot these normalized values?

Giovanni Ponce 2022-6-29

I want to normalize the all the datasets from 0 to 1 that are going to be plotted, so only the y-axis(datasets) are normalized.

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Answer 1

NIVEDITA MAJEE 2022-6-29

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在 MATLAB Online 中打开

Hi Giovanni,

You can use the ‘normalize’ function to normalize the output data. In the line 71 you can replace it with

plot(t_sim, normalize(sim_data.Pd, 'range'), 'r', 'LineWidth', 1.2);

The “normalize(sim_data.Pd, 'range')” will normalize your data between 0 and 1.

I have used the piece of code in the attached screenshot, and instead of simulated datapoints I have used “rand function” to generate random numbers to be used later for plotting.

Here is the code and later you can also find the generated plot with the code:

sim_data = 20*rand(10,2); %using rand function to generate a 10x2 matrix of random numbers between 0 and 20

t_sim = linspace(0,1,10); %creating a vector with 10 evenly spaced values between 0 to 1

figure;

set(gca, 'FontSize', 10);

hold on;

grid on;

box on;

plot(t_sim, normalize(sim_data(:,1), 'range'), 'b', 'LineWidth', 1.2);

plot(t_sim, normalize(sim_data(:,2), 'range'), 'r', 'LineWidth', 1.2);

ylabel('Power (MW)')

xlabel({'Time (hour)'})

legend('Pset', 'Pd', 'Orientation', 'horizontal', 'location', 'southwest')

title('Dispatch power');

xlim([0 max(t_sim)])

For more information on the normalize function, refer to the following link:

https://in.mathworks.com/help/matlab/ref/double.normalize.html

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Giovanni Ponce 2022-6-30

You are a live saver! Thank you

Giovanni Ponce 2022-7-13

I have another question, If I would want to normilize the actual data instead of just the y axis, how would I make that possible?

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Answer 2

Aman Banthia 2022-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/1750205-how-to-normalize-output-data-for-a-plot#answer_996160

Hi Giovanni,

Seems like you can normalize the data using the normalize function. But there is no method named 'sim_data' there are a fixed set of data you can normalize using this function.

Refer to the following MATLAB document to know about the Normalization Methods of the normalize function:

https://in.mathworks.com/help/matlab/ref/double.normalize.html