How can i take the log2 of x plus 1 of a matrix

i have a table table with variable names and data below it. Id like to take the log base 2 of (x+1)

Answer 1

[John D'Errico]

What function in MATLAB gives the log, with base 2?

help log2

 LOG2   Base 2 logarithm and dissect floating point number.
    Y = LOG2(X) is the base 2 logarithm of the elements of X.
 
    [F,E] = LOG2(X) for each element of the real array X, returns an
    array F of real numbers, usually in the range 0.5 <= abs(F) < 1,
    and an array E of integers, so that X = F .* 2.^E.  Any zeros in X
    produce F = 0 and E = 0.  This corresponds to the ANSI C function
    frexp() and the IEEE floating point standard function logb().
 
    See also LOG, LOG10, POW2, NEXTPOW2, REALMAX, REALMIN.

    Documentation for log2
       doc log2

    Other functions named log2

       codistributed/log2    fints/log2    gpuArray/log2    sym/log2

So what line of code would add 1 to x, and then take the log, base 2?

Answer 2

[Walter Roberson]

output = varfun(@(X) log2(X+1), YourTable)