Calculating the read counts from LogCPM values (EdgeR)

Question

[Sheila]

Hi, I have a list of logCPM values for a long list of genes. I would like to calculate the read counts from these values. I see that in EdgeR there is a getCounts() function, however it requires the data be in a DGEList-class format. The logCPM values I have, unfortunately is older and was not provided to me in the structure required for getCounts(). Can anyone help how I could go about back-calculating to read counts?