49 lines
1.0 KiB
JavaScript
49 lines
1.0 KiB
JavaScript
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import Vector from "./Vector.js"
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function random() {
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let seed = 12345; // fixed seed
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return function() {
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seed = ( seed * 16807 ) % 2147483647;
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return ( seed - 1 ) / 2147483646;
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};
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}
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const randomFix = random();
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export default class Matrix {
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constructor( rows, cols, fillValue = 0 ) {
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this.rows = rows;
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this.cols = cols;
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this.data = new Array( rows );
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for ( let i = 0 ; i < rows ; i++ ) {
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this.data[ i ] = new Array( cols );
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for ( let j = 0 ; j < cols ; j++ ) {
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this.data[ i ][ j ] = fillValue;
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}
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}
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}
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static random( rows, cols, scale = 0.1 ) {
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const mat = new Matrix( rows, cols );
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for ( let i = 0 ; i < rows ; i++ ) {
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for ( let j = 0 ; j < cols ; j++ ) {
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mat.data[ i ][ j ] = ( randomFix() - 0.5 ) * scale;
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}
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}
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return mat;
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}
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static matVecMul( mat, vec ) {
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const result = new Vector( mat.rows );
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for ( let i = 0 ; i < mat.rows ; i++ ) {
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let sum = 0;
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for ( let j = 0 ; j < mat.cols ; j++ ) {
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sum += mat.data[ i ][ j ] * vec.data[ j ];
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}
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result.data[ i ] = sum;
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}
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return result;
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}
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}
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