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**TRANSFORM>DICHOTOMIZE **

**PURPOSE **Form a binary matrix from a valued matrix.

**DESCRIPTION **Given a specified cut-off value then the valued matrix is made binary by comparing each element with the cut-off value. Comparisons can be strictly greater, greater than or equal, equal, less than or equal or strictly less than.

**PARAMETERS**

**Input dataset:**

** **Name of matrix to be dichotomized. Data type: Matrix.

** Cut-off value:** (Default = 0).

Any user-specified value. **MEAN** gives the average value of all the cells in the input matrix.

**Diagonal OK?** (Default = No)

**Yes** means that diagonal elements are considered valid in calculating the mean.

**No** ignores diagonal values.

** Cut-off operator:** (Default = 'GT').

Choices are:

**GT** - Matrix values replaced by a 1 if they are strictly greater than the cut-off value and 0 otherwise.

**GE **- Matrix values replaced by a 1 if they are greater than or equal to the cut-off value and 0 otherwise.

**EQ** - Matrix values replaced by a 1 if they are equal to the cut-off value and 0 otherwise.

**LE** - Matrix values replaced by a 1 if they are less than or equal to the cut-off value and 0 otherwise.

**LT -** Matrix values replaced by a 1 if they are strictly less than the cut-off value and 0 otherwise.

**Output dataset:** (Default = 'Dichotomize').

Name of file which contains dichotomized matrix.

**LOG FILE **Dichotomized matrix.

**TIMING** O(N^2).

**COMMENTS **None.

**REFERENCES **None.