Decimation function needs a double precision vector
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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])
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.
采纳的回答
Using parentheses () on table returns a sub-table.
x = primes(20)';
y = (1:numel(x))';
T = table(x,y)
%When you use (), Output is returned as a table
T(:,1)
Use curly braces
T{:,1}
or dot indexing to access the content of the table in the stored format -
T.(1)
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
Taylor Azizeh
2023-7-13
Dyuman Joshi
2023-7-13
"Do you think I'll have to go one column at a time?"
Yes, because the expected input to the function is a vector (as the error states as well). Whereas data_XYZ_50Hz is not a vector.
You will have to use a for loop going through each column.
Taylor Azizeh
2023-7-13
Taylor Azizeh
2023-7-13
Dyuman Joshi
2023-7-13
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
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