1CLOG(3) Linux Programmer's Manual CLOG(3)
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6 clog, clogf, clogl - natural logarithm of a complex number
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9 #include <complex.h>
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11 double complex clog(double complex z);
12 float complex clogf(float complex z);
13 long double complex clogl(long double complex z);
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15 Link with -lm.
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18 The logarithm clog() is the inverse function of the exponential
19 cexp(3). Thus, if y = clog(z), then z = cexp(y). The imaginary part
20 of y is chosen in the interval [-pi,pi].
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22 One has:
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24 clog(z) = log(cabs(z)) + I * carg(z)
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26 Note that z close to zero will cause an overflow.
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29 These functions first appeared in glibc in version 2.1.
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32 C99.
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35 cabs(3), cexp(3), clog10(3), clog2(3), complex(7)
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38 This page is part of release 3.53 of the Linux man-pages project. A
39 description of the project, and information about reporting bugs, can
40 be found at http://www.kernel.org/doc/man-pages/.
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44 2008-08-11 CLOG(3)