lin2log, log2lin

Convert the elements of x to logarithmic values (e.g. dB) and vice versa.

Usage

lin2log(x {, ref {, fac}})

log2lin(x {, ref {, fac}})

x

a scalar, vector or matrix

ref

the reference value; must be a positive number (default=1)

fac

the factor; must be a positive number (default=20)

Result

The result r has the same type as x and contains the converted elements of x

• lin2log: r_i,j = fac * log₁₀(x_i,j / ref)
• log2lin: r_i,j = ref * 10 ^ (x_i,j / fac)

See also

log, exp

Example:

#a := eval 20*log(2)     // convert factor 2 to 6dB
#b := eval 20*log(2,10)  // same as above
#c := eval 20*log(vv(2,10,20,50,100))
// $#c = { 6.02, 20, 26.02, 33.98, 40 }

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