log

Purpose

Computes the log of all elements of x.

Format

y = log(x)

Parameters:

x (NxK matrix or N-dimensional array) – data

Returns:

y (NxK matrix or N-dimensional array) – containing the log 10 values of the elements of x.

Examples

// Create a 3x3 matrix of random uniform integers from 1
// to 11
x = round(rndu(3,3)*10+1);
y = log(x);

If x is equal to:

4.000  9.000  2.000
5.000  3.000  7.000
2.000  6.000 10.000

Then y will be equal to:

0.602  0.954  0.301
0.699  0.477  0.845
0.301  0.778  1.000

Remarks

log() is defined for \(x ≠ 0\).

You can turn the generation of complex numbers for negative inputs on or off in the GAUSS configuration file, and with the sysstate() function, case 8. If you turn it off, log() will generate an error for negative inputs.

If x is already complex, the complex number state doesn’t matter; log() will compute a complex result.

x can be any expression that returns a matrix.

See also

Functions ln()