Why do i get NaN?

3 Ansichten (letzte 30 Tage)
Tim K
Tim K am 6 Mai 2021
Kommentiert: Tim K am 6 Mai 2021
Dear all,
i try to run this very simpel Code (it worked already with other Input files with identical build-up). I try to import a table with 2 columns from 6 .csv files each and want to declare a starting point in column 1 for every table with "anfang" to average all values from column 2 from the starting point to end. As i said it works with other .csv files but in this case i only get an average value for the first 2 files. For the other 4 files i get "NaN". I tried to debug the code but i dont get any errors at this point and i also checked the columns of the imported tables but everything seems good (no critical values that could affect mathematical operations or something else). I also tried to change the values in "anfang" to try a earlier or later starting point but its also didn't work.
Thanks for help
clear all
close all
filename = dir('*.csv');
%% avgT
anfang = [700,700,200,100,140,140];
for idx1 = 1:length(filename)
Cell{idx1} = readtable(filename(idx1).name);
Cell{idx1} = table2array(Cell{idx1});
avgT (idx1) = mean(Cell{idx1}(anfang:end,2))
  2 Kommentare
KSSV am 6 Mai 2021
Try using nanmean instead of mean.
Tim K
Tim K am 6 Mai 2021
I could solve this problem with some help in an other way but thank you for your time!

Melden Sie sich an, um zu kommentieren.

Antworten (1)

Scott MacKenzie
Scott MacKenzie am 6 Mai 2021
Bearbeitet: Scott MacKenzie am 6 Mai 2021
It's hard to say without being able to run your code, but it seems to me that anfang in
avgT(idx1) = mean(Cell{idx1}(anfang:end,2));
should include an index. Try
avgT(idx1) = mean(Cell{idx1}(anfang(idx1):end,2));
Also, why are you putting the data from the files into a cell array of cell arrays? The lines in your for-loop can be simplified. Try
T = readtable(filename(idx1).name);
C = table2array(T);
avgT(idx1) = mean(C(anfang(idx1):end,2));
  1 Kommentar
Tim K
Tim K am 6 Mai 2021
Thank you very much! Inlcude the index at "anfang" worked well. And also thank you for simplifications!

Melden Sie sich an, um zu kommentieren.


Mehr zu Matrices and Arrays finden Sie in Help Center und File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by