how to plot a time series from row 1000 to 3000

Question

Atefeh 2023-10-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033849-how-to-plot-a-time-series-from-row-1000-to-3000

编辑： dpb 2023-10-16

采纳的回答： Voss

在 MATLAB Online 中打开

Hello and have a good day

I have a time series and I wanna plot 3D for t=0.1:0.001:0.3

Here is my code for all the time series

LD6 = load('output_a_f_LL_bus5.mat');
Data = LD6.Id_6.Data;
t = LD6.t.Time;
figure
plot3(Data(:,1), Data(:,2), t)
grid on
xlabel('Id')
ylabel('Iq')
zlabel('time')

How can I plot3D the time series after the 1000th row (or for the times between 0.1 to 0.3)?

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Dyuman Joshi 2023-10-15

You are using output_a_f_LL_bus5.mat to load the variables but you have provided a different .mat file.

Atefeh 2023-10-15

output_a_f_LL_bus5.mat

Yes, You are right, Here is the output file

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Answer 1

Voss 2023-10-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033849-how-to-plot-a-time-series-from-row-1000-to-3000#answer_1333559

在 MATLAB Online 中打开

output_a_f_LL_bus5.mat

LD6 = load('output_a_f_LL_bus5.mat');

Data = LD6.Id_6.Data;

t = LD6.t.Time;

figure

idx = t >= 0.1 & t <= 0.3;

plot3(Data(idx,1), Data(idx,2), t(idx))

grid on

xlabel('Id')

ylabel('Iq')

zlabel('time')

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Answer 2

dpb 2023-10-15

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033849-how-to-plot-a-time-series-from-row-1000-to-3000#answer_1333564

编辑：dpb 2023-10-16

在 MATLAB Online 中打开

d=dir('*bus*.mat');

load(d.name,'Id_6')

whos

Name Size Bytes Class Attributes Id_6 1x1 72372 timeseries ans 1x47 94 char cmdout 1x33 66 char d 1x1 1157 struct

head(Id_6)

timeseries with properties: Events: [] Name: '' UserData: [] Data: [3001×3 double] DataInfo: [1×1 tsdata.datametadata] Time: [3001×1 double] TimeInfo: [1×1 tsdata.timemetadata] Quality: [] QualityInfo: [1×1 tsdata.qualmetadata] IsTimeFirst: 1 TreatNaNasMissing: 1 Length: 3001

ix=(Id_6.Time>=0.1)&(Id_6.Time<=0.3);

plot3(Id_6.Data(ix,1), Id_6.Data(ix,2), Id_6.Time(ix))

grid on

xlabel('Id')

ylabel('Iq')

zlabel('time')

I'd strongly suggest to convert over to using timetable instead of timeseries; I've not found anything really useful at all about the implementation of the time series objects; the syntax has generally been more in the way than helpful; even the doc suggests it. Unfortunately, it's another case where an experimental new data class was released into the wild and while it (like the ill-fated Statistics TB dataset class) proved to be less than an optimal solution, now it exists and seemingly will have to be carried around as excess baggage forever.

ADDENDUM:

In my own code here, I'd have written the above as

ix=iswithin(Id_6.Time,0.1,0.3);

where iswithin is my utility function kept in a Utilities folder on the matlabpath just behind the working directory

function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
%  [log] = iswithin(x,lo,hi)
%      returns T for x between lo and hi values, inclusive
  flg= (x>=lo) & (x<=hi);
end

This "syntactic sugar" function makes top level code much simpler to write/read and is particularly valuable when there are multiple ranges, etc., ...