How can I write ln in Matlab?

How can I write ln in this part of my code as I keep getting an error. Thank yon

%Gaussian parameters 
M= (1+nc)/2;                                %M=  mean number 
SD= sqrt (-(j-M)^2/(2*ln(20/100)));         %SD= standard derivation

Error in Code2 (line 44)

SD= sqrt (-(j-M)^2/(2*ln(20/100))); %SD= standard derivation

Answer 1

[Cris LaPierre]

MATLAB uses log for natural log and log10 for log base 10.

See documentation for log and log10.