Trimming data with for loop

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Sydney Kehoe
Sydney Kehoe 2021-6-8
评论： Star Strider 2021-6-8
I am trying to write a code that will use a specific column of data to start filling a new array when m(iii)>1, however, it now only gives back the data in the new array when m(iii)>1 so i'm not sure how to fix it. I also want it to collect 720000 data points starting when that first m(iii)>1. Any help would be appreciated, thank you.
length = 720000;
m = acq2.data(:,4);
empty_array2 = zeros(size(length));
for iii = 1:length
if m(iii) > 1
empty_array2(iii) = acq2.data(iii);
end
if iii <= length
end
end
  1 个评论
Gatech AE
Gatech AE 2021-6-8
Be careful naming variables after built-in functions. The "length" function returns the largest dimension of an input. Also, you have size(length) where length is defined as a scalar, so your empty_array2 variable is actually only 1 by 1 in size.

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Star Strider
Star Strider 2021-6-8
Ran in:
I am not certain what you want to do.
Try this —
acq2.data = randi([0 5], 10, 5) % Create Matrix
acq2 = struct with fields:
data: [10×5 double]
idx = acq2.data(:,4) > 1 % Select Rows
idx = 10×1 logical array
1 1 1 0 1 1 0 1 0 1
empty_array = acq2.data(idx,:) % Assign Selected Rows To 'empty_array'
empty_array = 7×5
3 2 3 2 2 2 5 2 3 0 0 4 2 4 3 3 3 4 5 4 4 2 3 4 5 0 2 5 4 2 3 0 1 5 5
This will create ‘empty_array’ with rows of ‘acq2.data’ with values in column 4 are greater than 1. It is probably easier (and more efficient) than the loop.
.
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Sydney Kehoe
Sydney Kehoe 2021-6-8
I just worked out a while loop which I think makes more sense but I am going to attempt to do another post since it is a very different format
Star Strider
Star Strider 2021-6-8
Great!
Please supply as many details in your new post as you can. A sample of the data you want to process would be important, as well as an example of the result you want.

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