DANGERc2sMATDFDS {dsDanger} | R Documentation |

Creates a matrix A on the serverside from matrix A on the clientside

```
DANGERc2sMATDFDS(
mdata.transmit,
from,
nrows.transmit,
ncols.transmit,
colnames.transmit,
colclass.transmit,
byrow,
dimnames
)
```

`mdata.transmit` |
is a character string in a format that can pass through the DataSHIELD R parser which specifies the name of the matrix or data.frame to be copied from the clientside to the serverside. |

`from` |
a character string specifying the source and nature of <mdata>. Fixed by clientside function to "clientside.matdf". |

`nrows.transmit` |
specifies the number of rows in the matrix to be created in a format that can pass through the DataSHIELD R parser. Fixed by the clientside function as equal to the number of rows in the clientside matrix to be transferred |

`ncols.transmit` |
specifies the number of columns in the matrix to be created in a format that can pass through the DataSHIELD R parser. Fixed by the clientside function as equal to the number of columns in the clientside matrix to be transferred |

`colnames.transmit` |
a transmissable vector specifying the name of each column in the matrix or data.frame being transferred from clientside to serverside. Generated automatically by clientside function. |

`colclass.transmit` |
a transmissable vector specifying the class of the vector representing each column in the matrix or data.frame being transferred from clientside to serverside. Generated automatically by clientside function. This allows the transmission of data.frames containing data of multiple classes. |

`byrow` |
a logical value specifying whether the matrix created on the serverside should be filled row by row or column by column fixed by the clientside function as FALSE (fill column by column). |

`dimnames` |
A dimnames attribute for the matrix: NULL or a list of length 2 giving the row and column names respectively. An empty list is treated as NULL, and a list of length one as row names only. If NULL (the default) the column names of the original <mdata> data.frame or matrix are taken across to specify the column names of the serverside matrix |

DANGERc2sMATDF is a serverside assign function called by ds.DANGERc2sMATDF This is a DANGER FUNCTION because it gives the clientside analyst a lot of power to create a data structure that is precise and complex on the severside. In fact this may be absolutely fine - the general rule is that concerns about disclosure relate entirely to aggregate functions rather than assign functions. However, for the moment this wil be kept as a DANGER FUNCTION and could later be considered for conversion to a standard function, if requested. This DANGER function was created from the ds.matrix function. A number of the parameters specifying the matrix to be generated are fixed by the nature of the clientside matrix itself rather than by explicitly stating them as arguments. In consequence, they have been removed from the list of arguments and are instead given invariant values in the first few lines of code. These include: from<-"clientside.matdf", nrows.scalar=NULL, ncols.scalar=NULL, byrow = FALSE. The <from> argument was originally a character string specifying the source and nature of <mdata>. Because this DANGER function is only intended to copy a clientside matrix or data.frame to the serverside, its value is fixed to "clientside.matdf". The <nrows.scalar> and <ncols.scalar> are fixed empirically by the number of rows and columns of the matrix to be transferred. <byrow> specifies writing the serverside matrix by columns or rows and this is always set as by column (i.e. FALSE).

the object specified by the <newobj> argument (or default name "new_matrix") which is written as a data.frame to the serverside. In addition, two validity messages are returned indicating whether <newobj> has been created in each data source and if so whether it is in a valid form.

Paul Burton for DataSHIELD Development Team

[Package *dsDanger* version 6.2.0 ]