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   6 .TH vz_pow_ 3MVEC "14 Dec 2007" "SunOS 5.11" "Vector Math Library Functions"
   7 .SH NAME
   8 vz_pow_, vc_pow_ \- vector complex power functions
   9 .SH SYNOPSIS
  10 .LP
  11 .nf
  12 cc [ \fIflag\fR\&.\|.\|. ] \fIfile\fR\&.\|.\|. \fB-lmvec\fR [ \fIlibrary\fR\&.\|.\|. ]
  13 
  14 \fBvoid\fR \fBvz_pow_\fR(\fBint *\fR\fIn\fR, \fBdouble complex * restrict\fR \fIz\fR,
  15      \fBint *\fR\fIstridez\fR, \fBdouble complex * restrict\fR \fIw\fR, \fBint *\fR\fIstridew\fR,
  16      \fBdouble complex * restrict\fR \fIu\fR, \fBint *\fR\fIstrideu\fR,
  17      \fBdouble *\fR \fItmp\fR);
  18 .fi
  19 
  20 .LP
  21 .nf
  22 \fBvoid\fR \fBvc_pow_\fR(\fBint *\fR\fIn\fR, \fBfloat complex * restrict\fR \fIz\fR,
  23      \fBint *\fR\fIstridez\fR, \fBfloat complex * restrict\fR \fIw\fR, \fBint *\fR\fIstridew\fR,
  24      \fBfloat complex * restrict\fR \fIu\fR, \fBint *\fR\fIstrideu\fR,
  25      \fBfloat *\fR \fItmp\fR);
  26 .fi
  27 
  28 .SH DESCRIPTION
  29 .sp
  30 .LP
  31 These functions evaluate the complex function \fIz\fR^\fIw\fR for an entire
  32 vector of values at once. The first parameter specifies the number of values to
  33 compute. Subsequent parameters specify the argument and result vectors. Each
  34 vector is described by a pointer to the first element and a stride, which is
  35 the increment between successive elements. The last argument is a pointer to
  36 scratch storage; this storage must be large enough to hold 3 * *\fIn\fR
  37 consecutive values of the real type corresponding to the complex type of the
  38 argument and result.
  39 .sp
  40 .LP
  41 Specifically, \fBvz_pow_\fR(\fIn\fR, \fIz\fR, \fIsz\fR, \fIw\fR, \fIsw\fR,
  42 \fIu\fR, \fIsu\fR, \fItmp\fR) computes \fIu\fR[\fIi\fR * *\fIsu\fR] =
  43 (\fIz\fR[\fIi\fR * *\fIsz\fR])^(\fIw\fR[\fIi\fR * *\fIsw\fR]) for each \fIi\fR
  44 = 0, 1, ..., *\fIn\fR - 1. The \fBvc_pow_()\fR function performs the same
  45 computation for single precision data.
  46 .sp
  47 .LP
  48 These functions are not guaranteed to deliver results that are identical to the
  49 results of the \fBcpow\fR(3M) functions given the same arguments.
  50 .SH USAGE
  51 .sp
  52 .LP
  53 The element count *\fIn\fR must be greater than zero. The strides for the
  54 argument and result arrays can be arbitrary integers, but the arrays themselves
  55 must not be the same or overlap. A zero stride effectively collapses an entire
  56 vector into a single element. A negative stride causes a vector to be accessed
  57 in descending memory order, but note that the corresponding pointer must still
  58 point to the first element of the vector to be used; if the stride is negative,
  59 this will be the highest-addressed element in memory. This convention differs
  60 from the Level 1 BLAS, in which array parameters always refer to the
  61 lowest-addressed element in memory even when negative increments are used.
  62 .sp
  63 .LP
  64 These functions assume that the default round-to-nearest rounding direction
  65 mode is in effect. On x86, these functions also assume that the default
  66 round-to-64-bit rounding precision mode is in effect. The result of calling a
  67 vector function with a non-default rounding mode in effect is undefined.
  68 .sp
  69 .LP
  70 Unlike the c99 \fBcpow\fR(3M) functions, the vector complex exponential
  71 functions make no attempt to handle special cases and exceptions; they simply
  72 use textbook formulas to compute a complex exponential in terms of real
  73 elementary functions. As a result, these functions can raise different
  74 exceptions and/or deliver different results from \fBcpow()\fR.
  75 .SH ATTRIBUTES
  76 .sp
  77 .LP
  78 See \fBattributes\fR(5) for descriptions of the following attributes:
  79 .sp
  80 
  81 .sp
  82 .TS
  83 tab() box;
  84 cw(2.75i) |cw(2.75i) 
  85 lw(2.75i) |lw(2.75i) 
  86 .
  87 ATTRIBUTE TYPEATTRIBUTE VALUE
  88 _
  89 Interface StabilityCommitted
  90 _
  91 MT-LevelMT-Safe
  92 .TE
  93 
  94 .SH SEE ALSO
  95 .sp
  96 .LP
  97 \fBcpow\fR(3M), \fBattributes\fR(5)