PLOTTING MULTIPLE Y AXES

Question

Willian 2024-7-27，20:54

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2140771-plotting-multiple-y-axes

编辑： dpb 2024-7-28，20:57

采纳的回答： Willian

data.csv

在 MATLAB Online 中打开

Good afternoon,

How could I create a graph with multiple y-axes: Millitm, PIT, TIT, PD, FIT

T2022_1 = readtable('data.csv', 'VariableNamingRule','preserve');
MyDateTime = T2022_1.Date + T2022_1.Time;
MyDateTime.Format = 'yyyy-MM-dd HH:mm:ss';
T2022_2 = [T2022_1(:,1) table(MyDateTime) T2022_1(:,[3:end])];
figure(1)
plot(T2022_2.MyDateTime, T2022_2.('PIT'), '-k', 'LineWidth',1, 'DisplayName', 'Pressure Separador')
grid on
xlabel('Date & Time')
ylabel('Pressure - Psig')
lgd = legend;
lgd.NumColumns = 1;

for the help, thank you in advance

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Umar 2024-7-27，21:05

Hi @Willian,

You can achieve these plots using the yyaxis function which will allow you to plot multiple datasets with different y-axes on the same graph. For more information on this function, please refer to

https://www.mathworks.com/help/matlab/ref/yyaxis.html

Below is my full code to help you achieve this:

% Read data from CSV file

T2022_1 = readtable('data.csv', 'VariableNamingRule', 'preserve');

% Combine Date and Time columns into a single datetime column

MyDateTime = T2022_1.Date + T2022_1.Time;

MyDateTime.Format = 'yyyy-MM-dd HH:mm:ss';

T2022_2 = [T2022_1(:,1) table(MyDateTime) T2022_1(:,3:end)];

% Create a figure for the plot

figure(1)

% Plot Pressure Separador (PIT) on the primary y-axis

yyaxis left

plot(T2022_2.MyDateTime, T2022_2.PIT, '-k', 'LineWidth', 1, 'DisplayName', 'Pressure Separador')

ylabel('Pressure - Psig')

% Add additional y-axes for other variables

yyaxis right

hold on

plot(T2022_2.MyDateTime, T2022_2.Millitm, '-b', 'LineWidth', 1, 'DisplayName', 'Millitm')

plot(T2022_2.MyDateTime, T2022_2.TIT, '-r', 'LineWidth', 1, 'DisplayName', 'TIT')

plot(T2022_2.MyDateTime, T2022_2.PD, '-g', 'LineWidth', 1, 'DisplayName', 'PD')

plot(T2022_2.MyDateTime, T2022_2.FIT, '-m', 'LineWidth', 1, 'DisplayName', 'FIT')

% Customize the plot

grid on

xlabel('Date & Time')

lgd = legend;

lgd.NumColumns = 1;

So, I used the above mentioned function yyaxis left to set the primary y-axis for the 'PIT' variable. Additional y-axes are added using yyaxis right for 'Millitm', 'TIT', 'PD', and 'FIT'. also, each dataset is plotted with a different color and line style for clarity and the legend is included to differentiate between the plotted variables.

Please see attached plots along with snippet code.

Hope, this answers your question.

Umar 2024-7-28，17:55

@dpb,

Thank you for sharing your feedback regarding mobile formatting. I understand that writing code on a phone can be challenging, especially for those who are not accustomed to it. Your perspective as someone who primarily uses a phone for communication is valuable and help me consider different user experiences.

dpb 2024-7-28，18:20

编辑：dpb 2024-7-28，20:57

" Your perspective as someone who primarily uses a phone for communication ..."

More accurately, that is "as someone who uses a phone for only communication (and even then reluctantly)..." :)

In my former life I was 25+ years a single consultant tied to always having to be available. When I returned to the family farm and gave up the consulting gig, one prime life objective was to not be tied to a pager or other means of being at another's beck and call. The phone mostly resides on the buffet in the dining room unless I do on (the fairly rare) occasion have something for which I do want to stay in touch. But, that's just me and I recognize that any more that is an anachronism.

ADDENDUM

I had really noticed what seemed to me to be a marked decline in the percentage of postings in which code was being formatted but had never thought to tie that to the increasing use of mobile devices. I do think if this is the root or major cause (and given Walter's description of doing so I can see why almost nobody would/does) then Mathworks needs to seriously consider the user intrface for those devices to try to make it less cumbersome. Having essentially no experience in the area, I'm certainly in no position to indicate how they are to do that, but it does seem to be an issue that hampers the functionality of the forum for all, not just mobile users.

PS

"as someone who uses a phone for only communication ..."

I stand corrected. I do find the camera of value to take pictures of equipment as disassembling for repair, etc., and in the same arena the flashlight can be helpful in dark crannies as well...

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