How can I replace "" entries in a table?

I imported a large table (300 x 450) and some of the blank entries were imported as "". For the purpose of this question, let me take a part of one column:

>> TT = T(end-4:end,end)

TT =

5×1 table

vm2PR

_____

VC02 ""

VC03 ""

VC04 "6"

VC05 "2"

VC06 ""

How do I replace these "" entries with numerical value 0.0 and the "2" and "6" entries as numerical values 2 and 6 respectively? This has to be done for the whole large table (which is named T). Thank you.

Answer 1

[madhan ravi]

iX=str2double(TT.vm2PR);
TT.vm2PR(isnan(iX))=0

[Kamal Premaratne]

This works perfectly. Thank you so much Madhan.