Finding a specific row in a matrix based on user inputs?

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Nicholas DeGarmo
Nicholas DeGarmo el 26 de Feb. de 2020
Comentada: KALYAN ACHARJYA el 27 de Feb. de 2020
I have a matrix with 365 rows and 7 columns, the first column is the month (1-12) and the second column is a day of that month. The user inputs what month they want to look at in a numeric value (1-12) and then the day they want (1-31), but then I need to take that input data and only find the array with those two specific values, I have no clue how to copy just that row based on those two inputs.
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KALYAN ACHARJYA
KALYAN ACHARJYA el 27 de Feb. de 2020
Editada: KALYAN ACHARJYA el 27 de Feb. de 2020
#Do the necessary changes, as required
%let say mat_data is the main matrix
mat_data=[1 1 3 4 56
1 2 3 4 50
1 3 4 5 90
2 3 5 6 70];
month=input('Enter the Month Any value 1-12: ');
day=input('Enter the Day Any value 1-31: ');
disp('The details is ');
mat_data(mat_data(:,1)==month & mat_data(:,2)==day,:)
  2 comentarios
KSSV
KSSV el 27 de Feb. de 2020
Why to use find when we have logical indexing at best?
KALYAN ACHARJYA
KALYAN ACHARJYA el 27 de Feb. de 2020
Yes, thanks for pointing it out

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KSSV
KSSV el 27 de Feb. de 2020
Editada: KSSV el 27 de Feb. de 2020
Let A be your matrix of size 365*7.
themonths = A(:,1) ;
thedays = A(:,2) ;
% Let us say I want 7th month and 7th day indices
m = 7 ; d = 7 ;
idx = themonths == m && thedays == d ;
iwant = A(idx,:) ;

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