Matrix Multiply - Android java.lang

Android examples for java.lang:Math Matrix

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Description

Matrix Multiply

Demo Code

/* Copyright Statement://ww  w . j a v a2s.  com
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 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein
 * is confidential and proprietary to MediaTek Inc. and/or its licensors.
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 * any reproduction, modification, use or disclosure of MediaTek Software,
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 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
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public class Main{
    public static float[][] MatrixMultiply(float[][] A, float[][] B) {
        int mA = A.length;
        int nA = A[0].length;
        int mB = B.length;
        int nB = A[0].length;
        if (nA != mB)
            throw new RuntimeException("Illegal matrix dimensions.");
        float[][] C = new float[mA][nB];
        for (int i = 0; i < mA; i++)
            for (int j = 0; j < nB; j++)
                for (int k = 0; k < nA; k++)
                    C[i][j] += (A[i][k] * B[k][j]);
        return C;
    }
    public static float[] MatrixMultiply(float[][] A, float[] x) {
        int m = A.length;
        int n = A[0].length;
        if (x.length != n)
            throw new RuntimeException("Illegal matrix dimensions.");
        float[] y = new float[m];
        for (int i = 0; i < m; i++)
            for (int j = 0; j < n; j++)
                y[i] += (A[i][j] * x[j]);
        return y;
    }
    public static float[] MatrixMultiply(float[] x, float[][] A) {
        int m = A.length;
        int n = A[0].length;
        if (x.length != m)
            throw new RuntimeException("Illegal matrix dimensions.");
        float[] y = new float[n];
        for (int j = 0; j < n; j++)
            for (int i = 0; i < m; i++)
                y[j] += (A[i][j] * x[i]);
        return y;
    }
}

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