My vectors are not the same length

Question

Gabriela 2023-9-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2021146-my-vectors-are-not-the-same-length

评论： Walter Roberson 2023-9-14

ver.mat

So, I'm working on a code for class and they're asking me to plot two variables that aren't the same length. My time vector is t=0:0.005:500 which is has a length of 1x100 while my other variables are 1x500. What should I do?

this is my code:

clear;
clc;
L=load("ver.mat");
t=0:0.005:500;
Ensembl_avg=mean(L.ver);
plot(t,Ensembl_avg);
hold on;
plot(t,L.actual_ver);

I've also provided the "ver.mat" file just in case.

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dpb 2023-9-14

在 MATLAB Online 中打开

ver.mat

load ver
whos
  Name              Size              Bytes  Class     Attributes

  actual_ver        1x500              4000  double              
  ans               1x32                 64  char                
  cmdout            1x33                 66  char                
  ver             100x500            400000  double              

So, what is ver versus actual_ver?

If this is a homework assignment, there must have been instructions as to what was expected -- think we would have to see this assignment to have any klew about it...

Walter Roberson 2023-9-14

在 MATLAB Online 中打开

t=0:0.005:500;
whos t
  Name      Size                 Bytes  Class     Attributes

  t         1x100001            800008  double              

Not length 100.

T = 0 : 5 : 500;
whos T
  Name      Size             Bytes  Class     Attributes

  T         1x101              808  double              

That would be a lot closer to 100... but notice that it is length 101. 0 is divisible by 5; 5 is divisible by 5, 10 is divisible by 5... up to 500 exactly is divisible by 5. There (0:100)*5 is 101 entries not 100 -- you have to count the endpoints.

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