Getting NaN for the mean of a vector, is this normal?

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Hi there,
So I wrote a code here an when I try to calc the mean I get a NaN result for the final mean. This is due inaround 5 hours and I have no idea what to do. Any ideas?
%% Get user input
Prototype_id = input('Please Enter the prototype ids in vector form: ');
Time_intial = input('Please input the activation times in vector form: ');
Time_Final = input('Please inputthe time of decay in vector form: ');
% Calculate the mean time for activation
Mean = mean(Time_intial);
% Calculate the mean time for decay
Mean_f = mean(Time_Final);
%% Display the result
disp(['The number of prototypes is: ', num2str(Prototype_id)]);
disp(['The average amount of time for activation is: ', num2str(Mean)]);
disp(['The average amount of time for decay is: ', num2str(Mean_f)]);
  3 Commenti
Loic Roy-Seger
Loic Roy-Seger il 9 Ott 2020
Please Enter the prototype ids in vector form: [3:8:14:17:21:22:25:32:34:40:46:43:48:49]
Please input the activation times in vector form: 0:12:6:17:32:14:35:22:10:18:29:23:4:15
Please inputthe time of decay in vector form: 130:115:158:180:250:292:117:217:231:172:123:182:218:200

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Risposte (2)

Ameer Hamza
Ameer Hamza il 9 Ott 2020
Modificato: Ameer Hamza il 9 Ott 2020
I think you misunderstand the colon operator. Read about it here: https://www.mathworks.com/help/matlab/ref/colon.html. You should input these values like this
prototype ids
[3, 8, 14, 17, 21, 22, 25, 32, 34, 40, 46, 43, 48, 49]
activation times
[0, 12, 6, 17, 32, 14, 35, 22, 10, 18, 29, 23, 4, 15]
time of decay
[130, 115, 158, 180, 250, 292, 117, 217, 231, 172, 123, 182, 218, 200]
  2 Commenti
Ameer Hamza
Ameer Hamza il 9 Ott 2020
Yes, it might cause confusion and bug in some cases. I have updated the answer to use commas as the separator.

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Sudhakar Shinde
Sudhakar Shinde il 9 Ott 2020
NaN returns the scalar representation of "not a number". Operations return NaN when they have undefined numeric results, such as 0/0 or 0*Inf.
  2 Commenti
Loic Roy-Seger
Loic Roy-Seger il 9 Ott 2020
See I know that and that's the reason why I'm confused because it's a vector with normal numbers that should work
Sudhakar Shinde
Sudhakar Shinde il 9 Ott 2020
Modificato: Sudhakar Shinde il 9 Ott 2020
time of decay in vector form gives an empty vector and hence mean is NaN.

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