Medcn: Difference between revisions
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===Purpose=== | ===Purpose=== | ||
Median center scales matrix to median zero. | Median center scales matrix to median zero. | ||
===Synopsis=== | ===Synopsis=== | ||
:[mcx,mx,msg] = medcn(x,''options'') | :[mcx,mx,msg] = medcn(x,''options'') | ||
===Description=== | ===Description=== | ||
MEDCN centers a matrix x to it's median and returns a matrix mcx with median zero columns and a vector of medians mx used to center the data. Optional input options is discussed below. | MEDCN centers a matrix x to it's median and returns a matrix mcx with median zero columns and a vector of medians mx used to center the data. Optional input options is discussed below. | ||
The output msg returns any warning messages. | The output msg returns any warning messages. | ||
===Options === | ===Options === | ||
*'''''''' ''options'' '' = a structure array with the following fields. | *'''''''' ''options'' '' = a structure array with the following fields. | ||
* '''display''': [ {'off'} | 'on'] Governs screen display. | * '''display''': [ {'off'} | 'on'] Governs screen display. | ||
* '''matrix_threshold''': {.15} Error threshold based on fraction of missing data in whole matrix. | * '''matrix_threshold''': {.15} Error threshold based on fraction of missing data in whole matrix. | ||
* '''column_threshold''': {.25} Error threshold based on fraction of missing data in single column. | * '''column_threshold''': {.25} Error threshold based on fraction of missing data in single column. | ||
===See Also=== | ===See Also=== | ||
[[auto]], [[mncn]], [[rescale]], [[scale]] | [[auto]], [[mncn]], [[rescale]], [[scale]] | ||
Revision as of 15:25, 3 September 2008
Purpose
Median center scales matrix to median zero.
Synopsis
- [mcx,mx,msg] = medcn(x,options)
Description
MEDCN centers a matrix x to it's median and returns a matrix mcx with median zero columns and a vector of medians mx used to center the data. Optional input options is discussed below.
The output msg returns any warning messages.
Options
- ''' options = a structure array with the following fields.
- display: [ {'off'} | 'on'] Governs screen display.
- matrix_threshold: {.15} Error threshold based on fraction of missing data in whole matrix.
- column_threshold: {.25} Error threshold based on fraction of missing data in single column.