take the length of each row

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Brave A
Brave A 2023-1-20
评论： Walter Roberson 2023-1-20
Hi
I have this file whih has values and 30 rows. I need to take the average of the length of each row for the attached file. How to do that? I tried but it gives the average among value and I need the length.

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Walter Roberson
Walter Roberson 2023-1-20
编辑：Walter Roberson 2023-1-20
Ran in:
This code assumes that each line ends with a comma and that the number of "values" is equal to the number of commas. It assumes that there are no missing values on a row, and that no row ends in a numeric value.
S = readlines('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1269270/val.txt');
numvals = cellfun(@length, regexp(S, ','))
numvals = 34×1
0 50 37 43 45 71 86 84 79 84
mean(numvals)
ans = 69.8824
  1 个评论
Walter Roberson
Walter Roberson 2023-1-20
Note: the difference in average between my results and The Cyclist, is because your file starts with a blank line, which is thus a line that contains zero values, and the zero is getting counted in the average.

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更多回答（1 个）

the cyclist
the cyclist 2023-1-20
Ran in:
There are probably a few ways to do this. Here is one, which relies on reading the file into a numeric array, which will pad the rows with NaN values.
val = readmatrix("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1269270/val.txt");
mean(~isnan(val),2)
ans = 30×1
0.5556 0.4111 0.4778 0.5000 0.7889 0.9556 0.9333 0.8778 0.9333 0.9667
  2 个评论
Brave A
Brave A 2023-1-20
I need how many values in each row then the average not the number of rows. I know they are 30 rows.
the cyclist
the cyclist 2023-1-20
Ran in:
Sorry, I misread. I think this slight change to the above code does what you want.
val = readmatrix("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1269270/val.txt");
rowCount = sum(~isnan(val),2)
rowCount = 30×1
50 37 43 45 71 86 84 79 84 87
meanRowCount = mean(rowCount)
meanRowCount = 79.2000

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