Decimation function needs a double precision vector

Question

Taylor Azizeh 2023-7-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1995723-decimation-function-needs-a-double-precision-vector

评论： Taylor Azizeh 2023-7-13

I am trying to decimate some data that was recorded at 100Hz down to 50Hz. So far, I extracted the three columns to decimate and tried:

data_X = data(:,[3])
Unrecognized function or variable 'data'.

It's a massive file, so here is the ouput preview, so you can get an idea of what is going into the next piece of code.

Then, I am trying to run the decimate function using...

data_X_50 = decimate(data_X,2);

resulting in this error:

.

I am very new to coding in MatLab and this is my first time posting a question here, so I really appreciate any help.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Dyuman Joshi 2023-7-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1995723-decimation-function-needs-a-double-precision-vector#answer_1272793

编辑：Dyuman Joshi 2023-7-13

在 MATLAB Online 中打开

Using parentheses () on table returns a sub-table.

x = primes(20)';
y = (1:numel(x))';
T = table(x,y)
T = 8×2 table
    x     y
    __    _

     2    1
     3    2
     5    3
     7    4
    11    5
    13    6
    17    7
    19    8
%When you use (), Output is returned as a table
T(:,1)
ans = 8×1 table
    x 
    __

     2
     3
     5
     7
    11
    13
    17
    19

Use curly braces

or dot indexing to access the content of the table in the stored format -

This assumes that the initial data is of double format. If it is of single format (which seems to be the only other option with the data given), convert it to double.

6 个评论
显示 4更早的评论隐藏 4更早的评论

Dyuman Joshi 2023-7-13

在 MATLAB Online 中打开

data_XYZ = data{:,[3 4 5]};
%Get the size of the array
s = size(data_XYZ);
%Decimation factor
r = 2;
%The decimated signal is shortened by a factor of r, so the length of
%output will be
n = ceil(s(1)/r);

Reference for the length - decimate

%Preallocating the final output
out = zeros(n,s(2));
%looping through the columns of the data
for k=1:s(2)
    out(:,k) = decimate(data_XYZ(:,k),r);
end

Taylor Azizeh 2023-7-13

Thank you so much for your help, Dyuman!

请先登录，再进行评论。

Decimation function needs a double precision vector

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

6 个评论
显示 4更早的评论隐藏 4更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

Decimation function needs a double precision vector

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

6 个评论 显示 4更早的评论隐藏 4更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

6 个评论
显示 4更早的评论隐藏 4更早的评论