search for: numbercolumn

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2002 May 07
2
passing a matrix to C++ with .C()?
It seems that it is possible to pass a matrix to C++ by using .C() The R part of the interface should be something like: ('C++function', matrix, numberRows, numberColumns ) ...I guess. The C++ part of the interface could be something like void C++( double matrix[][], int numberRows, numberColumns ) but C++ requires to indicate the number of columns, that is, instead of matrix[][], it should be double matrix[][ numberColumns ]... This does not look like the rig...
2008 Apr 13
0
[Fwd: Re: Assigning to multiple variables]
...te: > If we have a function that returns 2 or more values (such as dim as > applied to a matrix), can we assign these 2 or more values to an equal > number of differently named variables in one line? For example, is > there any way to do something like this: > > [NumberRows NumberColumns] <- dim(MatrixA) In that case R returns an object (a vector) with two values where the first is the number of rows and the second is the number of columns. Almost everything in R are objects. So: > d <- dim(attitude) > rows <- d[1] > rows [1] 30 Tom