divide every numeric value in table by same number

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Davindra Usov
Davindra Usov 2023-3-26
评论： Walter Roberson 2023-3-30
HI,
I want to divide every numeric value in my table by the same number but some columns have strings and some have numbers. I want to convert every number in the table from cm to m (but not the strings of course)
thanks

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Walter Roberson
Walter Roberson 2023-3-26
Ran in:
divisor = 2;
T = table(["hello"; "orange"], [1;3], [2; 4])
T = 2×3 table
Var1 Var2 Var3 ________ ____ ____ "hello" 1 2 "orange" 3 4
vt = vartype('numeric')
vt =
table vartype subscript: Select table variables matching the type 'numeric' See Access Data in a Table.
T{:,vt} = T{:,vt} / divisor
T = 2×3 table
Var1 Var2 Var3 ________ ____ ____ "hello" 0.5 1 "orange" 1.5 2
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Siddharth Bhutiya
Siddharth Bhutiya 2023-3-30
Ran in:
Adding on to Walter's answer. Starting 23a there are a lot of standard arithmetic operations that you can directly do on tables to make similar workflows easier. So in 23a you could also use parens indexing instead of brace to get the same results.
T = table(["hello"; "orange"], [1;3], [2; 4]);
vt = vartype("numeric");
T(:,vt) = T(:,vt) ./ 2
T = 2×3 table
Var1 Var2 Var3 ________ ____ ____ "hello" 0.5 1 "orange" 1.5 2
In your case since you have a table with mixed types there is a little more work to be done, however, if you only had numerics in you table then it would be very simple now.
T = table([1;3],[2;4]);
T = T./2
T = 2×2 table
Var1 Var2 ____ ____ 0.5 1 1.5 2
You can read more about math operations on tableshere.

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