stripdown of version 0.9

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+/*---------------------------------------------------------------------------*\
+
+  FILE........: comp_prim.h
+  AUTHOR......: David Rowe
+  DATE CREATED: Marh 2015
+
+  Complex number maths primitives.
+
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2015 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  This program is
+  distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+  License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __COMP_PRIM__
+#define __COMP_PRIM__
+
+/*---------------------------------------------------------------------------*\
+
+                               FUNCTIONS
+
+\*---------------------------------------------------------------------------*/
+
+inline static COMP cneg(COMP a)
+{
+    COMP res;
+
+    res.real = -a.real;
+    res.imag = -a.imag;
+
+    return res;
+}
+
+inline static COMP cconj(COMP a)
+{
+    COMP res;
+
+    res.real = a.real;
+    res.imag = -a.imag;
+
+    return res;
+}
+
+inline static COMP cmult(COMP a, COMP b)
+{
+    COMP res;
+
+    res.real = a.real*b.real - a.imag*b.imag;
+    res.imag = a.real*b.imag + a.imag*b.real;
+
+    return res;
+}
+
+inline static COMP fcmult(float a, COMP b)
+{
+    COMP res;
+
+    res.real = a*b.real;
+    res.imag = a*b.imag;
+
+    return res;
+}
+
+inline static COMP cadd(COMP a, COMP b)
+{
+    COMP res;
+
+    res.real = a.real + b.real;
+    res.imag = a.imag + b.imag;
+
+    return res;
+}
+
+inline static float cabsolute(COMP a)
+{
+    return sqrtf((a.real * a.real) + (a.imag * a.imag) );
+}
+
+/*
+ * Euler's formula in a new convenient function
+ */
+inline static COMP comp_exp_j(float phi){
+    COMP res;
+    res.real = cosf(phi);
+    res.imag = sinf(phi);
+    return res;
+}
+
+/*
+ * Quick and easy complex 0
+ */
+inline static COMP comp0(){
+    COMP res;
+    res.real = 0;
+    res.imag = 0;
+    return res;
+}
+
+/*
+ * Quick and easy complex subtract
+ */
+inline static COMP csub(COMP a, COMP b){
+    COMP res;
+    res.real = a.real-b.real;
+    res.imag = a.imag-b.imag;
+    return res;
+}
+
+/*
+ * Compare the magnitude of a and b. if |a|>|b|, return true, otw false.
+ * This needs no square roots
+ */
+inline static int comp_mag_gt(COMP a,COMP b){
+    return ((a.real*a.real)+(a.imag*a.imag)) > ((b.real*b.real)+(b.imag*b.imag));
+}
+
+/*
+ * Normalize a complex number's magnitude to 1
+ */
+inline static COMP comp_normalize(COMP a){
+    COMP b;
+    float av = cabsolute(a);
+    b.real = a.real/av;
+    b.imag = a.imag/av;
+    return b;
+}
+
+#endif