How do i add a time vector to a existing table?

Question

Wouter 2022-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/1882562-how-do-i-add-a-time-vector-to-a-existing-table

评论： Wouter 2022-12-21

I have a set of given data but they do not include a time. I am trying to add a time (Tijd) vector but if i add a time vector, i get the messages that vectors must be the same length.

The data is a set amount of measurements (4001) but with a sample rate of 50Hz. I ofcourse want the time to be in seconds. So I thought I would make the steps in the graph steps of 81 because 4001/50 ≈ 81. But even without the steps it still gives me the error of vectors must be the same length.

Any and all help is appreciated!

clear all

close all

clc

load('ACE2-opdracht-2-persoonlijk.mat', 'meetdata');

A = meetdata;

Motortoerental = A (:,1);

Stuurspanning = A (:,2);

Tijd = 1:81:4001;

figure;

subplot(1,2,1)

plot(Tijd, Motortoerental); hold on

xlabel('Tijd(s)')

ylabel('Toerental(Omw/min)')

grid;

subplot(1,2,2)

plot(Tijd, Stuurspanning); hold on

xlabel('Tijd(s)')

ylabel('Stuurspanning(V)')

grid;

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Stephen23 2022-12-21

在 MATLAB Online 中打开

Avoiding the possibility of floating point issues with the last value:

(0:4000)./50
ans = 1×4001
         0    0.0200    0.0400    0.0600    0.0800    0.1000    0.1200    0.1400    0.1600    0.1800    0.2000    0.2200    0.2400    0.2600    0.2800    0.3000    0.3200    0.3400    0.3600    0.3800    0.4000    0.4200    0.4400    0.4600    0.4800    0.5000    0.5200    0.5400    0.5600    0.5800