omxSelectRowsAndCols {OpenMx} | R Documentation |

## Filter rows and columns from an mxMatrix

### Description

This function filters rows and columns from a matrix using a single row or column R matrix as a selector.

### Usage

```
omxSelectRowsAndCols(x, selector)
omxSelectRows(x, selector)
omxSelectCols(x, selector)
```

### Arguments

`x` |
the matrix to be filtered |

`selector` |
A single row or single column R matrix indicating which values should be filtered from the mxMatrix. |

### Details

omxSelectRowsAndCols, omxSelectRows, and omxSelectCols returns the filtered entries in a target matrix specified by a single row or single column selector matrix. Each entry in the selector matrix is treated as a logical data indicating if the corresponding entry in the target matrix should be excluded (0 or FALSE) or included (not 0 or TRUE). Typically the function is used to filter data from a target matrix using an existence vector which specifies what data entries are missing. This can be seen in the demo: RowObjectiveFIMLBivariateSaturated.

### Value

Returns a new matrix with the filtered data.

### References

The function is most often used when filtering data for missingness. This can be seen in the demo: RowObjectiveFIMLBivariateSaturated. The OpenMx User's guide can be found at https://openmx.ssri.psu.edu/documentation. The omxSelect* functions share some similarity to the Extract function in the R programming language.

### Examples

```
loadings <- matrix(1:9, 3, 3, byrow= TRUE)
existenceList <- c(1, 0, 1)
existenceList <- matrix(existenceList, 1, 3, byrow= TRUE)
rowsAndCols <- omxSelectRowsAndCols(loadings, existenceList)
rows <- omxSelectRows(loadings, existenceList)
cols <- omxSelectCols(loadings, existenceList)
```

*OpenMx*version 2.21.11 Index]