Programmer Guide/Command Reference/EVAL/log2lin: Difference between revisions
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{{DISPLAYTITLE:lin2log, log2lin}} | {{DISPLAYTITLE:lin2log, log2lin}} | ||
Convert the elements of ''x'' to logarithmic values (e.g. dB) and vice versa. | Convert the elements of ''x'' to logarithmic values (e.g. dB) and vice versa. | ||
Revision as of 14:34, 6 April 2011
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: ri,j = fac * log10(xi,j / ref)
- log2lin: ri,j = ref * 10 ^ (xi,j / fac)
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 }
