Description Usage Arguments Details Value Note

Translate raw gene abundance data into log2 fold change data commonly called M-values

1 | ```
expressionMatrixToMvalue(x, average.FUN = median, minIntensity = 0, small.offset = 1)
``` |

`x` |
Matrix of gene expression data, as form |

`average.FUN` |
The averaging function to apply to each row of |

`minIntensity` |
The minimum allowed value for elements of |

`small.offset` |
The linear offset to add to all row elements, before division and log2 transform, to prevent divide-by-zero results and to minimize extreme fold changes from very low expression values |

After M-value transformation, those row elements that are greater than the average expression will be positive, while elements lower than the average expression will be negative values. A value of 1.0 means 2-fold higher expression and a value of -2.0 means 4-fold lower expression.

A matrix of M-value fold change data, of the same dimensions and names as `m`

, suitable for heatmaps, etc.

This function is called by 'expressionHeatmap()'

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