Error Using Plot: Vectors Must Be The Same Length

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Aphile
Aphile 2022-8-31
编辑： Matt J 2022-8-31
Hi, I'm getting this error when trying to plot my 2 graphs: Vectors must be the same length. I am very new to matlab and I understand this is a common problem but couldn't figure out how to change my code so it works just by looking at other people's more complicated situations of the same error. It is a (22875x4 double)
This is my code (where DataPoints is the name of my file):
clc
Fs=1000
variable1=(DataPoints);
variable2=0.01:Fs/10000:length(variable1)*Fs/1000
variable3=(DataPoints);
figure(1);
plot(variable2,variable3)
variable4=variable1;
variable5=length(variable1);
variable6=Fs;
[P1,F1]=pwelch(variable4,variable5,variable6);
Figure(2);
Plot(F1,P1)
  2 个评论
Torsten
Torsten 2022-8-31
And do you get the same output for
numel(variable2)
numel(variable3)
?
The error message says: no. So change variable2 accordingly (e.g.
variable2 = linspace(0.01,numel(variable3),numel(variable3))
Aphile
Aphile 2022-8-31
I just tried this and it says "Unrecognizable function or variable."

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回答（1 个）

Matt J
Matt J 2022-8-31
编辑：Matt J 2022-8-31
Check the lengths of the variables you are plotting:
whos variable2 variable3 P1 F1
There is no gaurantee that I can see, based on the code you've shown, that variable2 and variable3 would be the same length.
  2 个评论
Aphile
Aphile 2022-8-31
编辑：Aphile 2022-8-31
I don't think they are as this is data from a dynamic test and im trying to plot a psd as well as time-acceleration graph.
Matt J
Matt J 2022-8-31
编辑：Matt J 2022-8-31
If they are not the same length, what does it mean to you to "plot" them? A plot consists of coordinate pairs (x,y). If the inputs are not vectors with the same number of elements, how can you create pairs?

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