The Biomedical Genomics Workbench lets you transform expression values based on logarithm and adding a constant:

        Toolbox | Transcriptomics Analysis (Image expressionfolder)| Transformation and Normalization | Transform (Image transformation)

Select a number of samples ( (Image array) or (Image rnaseq)) or an experiment (Image experiment) and click Next.

This will display a dialog as shown in figure 26.63.

Image transform_step2
Figure 26.63: Transforming expression values.

At the top, you can select which values to transform (see Selecting transformed and normalized values for analysis).

Next, you can choose three kinds of transformation:

Click Next if you wish to adjust how to handle the results. If not, click Finish.