How do I take the power of elements in a table?

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T4H14
T4H14 2018-4-20
编辑： Peter Perkins 2018-4-20
I have a table called NYLD1 and I want to create some new variables that are the squares and cubes of the variables columns 29:32 so I wrote the following:
cur_varnames = NYLD1.Properties.VariableNames;
for K = [29:32]
thisvarname = cur_varnames{K};
thisval = NYLD1.(thisvarname);
sq_varname = [thisvarname '2'];
cu_varname = [thisvarname '3'];
NYLD1.(sq_varname) = thisval .^ 2;
NYLD1.(cu_varname) = thisval .^ 3;
end
However, I get the following error when I run this:
Undefined function 'power' for input arguments of type 'table'.
How can I fix this?
  1 个评论
Peter Perkins
Peter Perkins 2018-4-20
编辑：Peter Perkins 2018-4-20

It's funny. Some people seem to gravitate to using dot subscripting, some to braces. They both do "contents of", but I always suggest dot for one at a time, braces for multiple at a time. Nothing to do with your real question, but in this case I'd suggest

names = NYLD1.Properties.VariableNames(29:32);
sq_names = ...
cu_names = ...
NYLD1{:,sq_names} = NYLD1{:,names}.^2;
NYLD1{:,cu_names} = NYLD1{:,names}.^3;

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采纳的回答

Peter Perkins
Peter Perkins 2018-4-20
Based on the error you cite, it seems that one or more of those variables are themselves tables. Nothing wrong with that, you'll just have to do something slightly different.

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