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Adding values to a table

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John
John 2023-10-7
回答： Star Strider 2023-10-7
Hello everyone,
I'm trying to run through a specific column of a table and add values to the rows in that column.
How do I actually refer to the rows/cells of the table that I want to access? In a low level language like C it would be row[i] but I don't know the equivalent in MATLAB.
I've put the code below with a comment in the for loop explaining what I want to do.
Kind regards,
John
%Creates a table called 'tab' using the data in the coronavirus-cases.csv file.
tab = readtable("coronavirus-cases.csv");
%Creates a table called 'newTabCol' with the height of tab and a width of 1.
newTabCol = zeros(height(tab), 1);
%Adds the column and titles it "Seven Day Average".
tab.SevenDayAverage = newTabCol;
for i = 1: height(tab)
%Set all values in SevenDayAverage to 1.
end
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-10-7
Why not set the values in the newTabCol array and assign it like you have done (instead of going through the for loop)?
"How do I actually refer to the rows/cells of the table that I want to access?"
Access Data in Tables

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采纳的回答

Star Strider
Star Strider 2023-10-7
Ran in:
One approach (that works) —
DateTime = datetime([2020 01 01]) + calmonths(0:5)';
Incidence = randi(10,6,1);
tab = table(DateTime,Incidence)
tab = 6×2 table
DateTime Incidence ___________ _________ 01-Jan-2020 9 01-Feb-2020 8 01-Mar-2020 9 01-Apr-2020 4 01-May-2020 7 01-Jun-2020 2
newRow = {datetime('01-Jul-2020') 8};
tab(end+1,:) = newRow
tab = 7×2 table
DateTime Incidence ___________ _________ 01-Jan-2020 9 01-Feb-2020 8 01-Mar-2020 9 01-Apr-2020 4 01-May-2020 7 01-Jun-2020 2 01-Jul-2020 8
.

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