From 8368886c1b78ffd597915f8624fe88edd5b608d1 Mon Sep 17 00:00:00 2001
From: Martmists <martmists@gmail.com>
Date: Sat, 28 Dec 2024 02:49:09 +0100
Subject: [PATCH] ifft

---
 README.md                                     |  2 +-
 build.gradle.kts                              |  2 +-
 .../martmists/ndarray/simd/F64TwoAxisArray.kt | 28 ++++++++++++++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0637e50..99a3e51 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ repositories {
 }
 
 dependencies {
-    implementation("com.martmists.ndarray-simd:ndarray-simd:1.3.0")
+    implementation("com.martmists.ndarray-simd:ndarray-simd:1.3.1")
 }
 ```
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 939373a..e7f2fe7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -14,7 +14,7 @@ plugins {
 }
 
 group = "com.martmists.ndarray-simd"
-version = "1.3.0"
+version = "1.3.1"
 val isProduction = (findProperty("production") ?: System.getProperty("production")) != null
 
 repositories {
diff --git a/src/commonMain/kotlin/com/martmists/ndarray/simd/F64TwoAxisArray.kt b/src/commonMain/kotlin/com/martmists/ndarray/simd/F64TwoAxisArray.kt
index 3a53aff..fb349ab 100644
--- a/src/commonMain/kotlin/com/martmists/ndarray/simd/F64TwoAxisArray.kt
+++ b/src/commonMain/kotlin/com/martmists/ndarray/simd/F64TwoAxisArray.kt
@@ -1,7 +1,6 @@
 package com.martmists.ndarray.simd
 
 import com.martmists.ndarray.simd.impl.create
-import com.martmists.ndarray.simd.impl.unsupported
 
 /**
  * A 2D specialization type for [F64Array].
@@ -390,6 +389,23 @@ interface F64TwoAxisArray : F64Array {
      */
     fun fftC2CInPlace()
 
+    /**
+     * Performs an inverse Complex-to-Complex FFT on this array in-place.
+     * The second axis has to be [real, imag].
+     * The resulting array is not normalized.
+     *
+     * @since 1.3.1
+     */
+    fun ifftC2CInPlace() {
+        // Conjugate
+        V[_I, 1] = -V[_I, 1]
+
+        fftC2CInPlace()
+
+        // Conjugate again
+        V[_I, 1] = -V[_I, 1]
+    }
+
     /**
      * Performs a Complex-to-Complex FFT on this array.
      * The second axis has to be [real, imag].
@@ -400,6 +416,16 @@ interface F64TwoAxisArray : F64Array {
      */
     fun fftC2C() = copy().apply { fftC2CInPlace() }
 
+    /**
+     * Performs an inverse Complex-to-Complex FFT on this array.
+     * The second axis has to be [real, imag].
+     * The resulting array is not normalized.
+     *
+     * @return the IFFT result
+     * @since 1.3.1
+     */
+    fun ifftC2C() = copy().apply { ifftC2CInPlace() }
+
     companion object {
         /**
          * Creates a [F64TwoAxisArray] from a [DoubleArray].