How do you remove a value from a table based on its value

16 vues (au cours des 30 derniers jours)
Daniel Gaggini
Daniel Gaggini le 7 Mai 2023
I am trying to remove the columns from the tollowing Combined table if they have a Value of 1.
I am a trying to find a method that deletes the colunn based on its value rather than deleting the column based on its heading, as it value may change to a 1 or 0 depending on the data set.
This is what I currently have but I am recieving the following error. If anyone has any advice that would be great!
Value = ([0,0,1,1,0])
Value = 1×5
0 0 1 1 0
Heading = (["Radius", "Speed", "Type", "Location", "ID"])
Heading = 1×5 string array
"Radius" "Speed" "Type" "Location" "ID"
Combined = array2table([Value; Heading])
Combined = 2×5 table
Var1 Var2 Var3 Var4 Var5 ________ _______ ______ __________ ____ "0" "0" "1" "1" "0" "Radius" "Speed" "Type" "Location" "ID"
Combined(Combined(1,:)>0,:) = []
Error using >
Applying the function 'gt' to the variable 'Var1' generated an error.

Caused by:
Error using >
Comparison between string and double is not supported.
  2 commentaires
VBBV
VBBV le 8 Mai 2023
% first approach & simpler
Value = ([0,0,1,1,0]);
idx = Value > 0;
Heading = (["Radius", "Speed", "Type", "Location", "ID"]);
Combined = array2table([Value; Heading]);
Combined(:,idx) = []
Combined = 2×3 table
Var1 Var2 Var5 ________ _______ ____ "0" "0" "0" "Radius" "Speed" "ID"
% second approach using additional functions
Value = ([0,0,1,1,0]);
Heading = (["Radius", "Speed", "Type", "Location", "ID"]);
Combined = array2table([Value; Heading]);
idx = str2double(table2array(Combined(1,:))) > 0
idx = 1×5 logical array
0 0 1 1 0
Combined(:,idx) = []
Combined = 2×3 table
Var1 Var2 Var5 ________ _______ ____ "0" "0" "0" "Radius" "Speed" "ID"
Daniel Gaggini
Daniel Gaggini le 8 Mai 2023
Thank you very much for your time and your answer.

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Réponse acceptée

the cyclist
the cyclist le 7 Mai 2023
Modifié(e) : the cyclist le 7 Mai 2023
One can do what you ask as follows:
Value = ([0,0,1,1,0]);
Heading = (["Radius", "Speed", "Type", "Location", "ID"]);
Combined = array2table([Value; Heading]);
Combined(:,Combined{1,:} == "1") = []
Combined = 2×3 table
Var1 Var2 Var5 ________ _______ ____ "0" "0" "0" "Radius" "Speed" "ID"
In your simple example, MATLAB had to convert the numeric values 0 and 1 to the strings "0" and "1", to store them in the same column with other strings.
  2 commentaires
the cyclist
the cyclist le 7 Mai 2023
Also, I can't shake the feeling that you are storing your data in a table in a very unconventional way, and therefore will experience many of these awkward operations. I suggest learning about the tidy format.
Daniel Gaggini
Daniel Gaggini le 8 Mai 2023
Thank you very much for your time and your answer. Also thanks for the learning link. :)

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