Element-wise operations: Difference between revisions
Added C# implementation
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Line 314:
for_i for_j {x = a[i][j]; b[i][j] = res;}}
OPS(mul, x*s);OPS(div, x/s);OPS(add, x+s);OPS(sub, x-s);OPS(pow, pow(x, s));</lang>
=={{header|C sharp}}==
<lang csharp>using System;
using System.Collections.Generic;
using System.Linq;
public static class ElementWiseOperations
{
private static readonly Dictionary<string, Func<double, double, double>> operations =
new Dictionary<string, Func<double, double, double>> {
{ "add", (a, b) => a + b },
{ "sub", (a, b) => a - b },
{ "mul", (a, b) => a * b },
{ "div", (a, b) => a / b },
{ "pow", (a, b) => Math.Pow(a, b) }
};
private static readonly Func<double, double, double> nothing = (a, b) => a;
public static double[,] DoOperation(this double[,] m, string name, double[,] other) =>
DoOperation(m, operations.TryGetValue(name, out var operation) ? operation : nothing, other);
public static double[,] DoOperation(this double[,] m, Func<double, double, double> operation, double[,] other) {
if (m == null || other == null) throw new ArgumentNullException();
int rows = m.GetLength(0), columns = m.GetLength(1);
if (rows != other.GetLength(0) || columns != other.GetLength(1)) {
throw new ArgumentException("Matrices have different dimensions.");
}
double[,] result = new double[rows, columns];
for (int r = 0; r < rows; r++) {
for (int c = 0; c < columns; c++) {
result[r, c] = operation(m[r, c], other[r, c]);
}
}
return result;
}
public static double[,] DoOperation(this double[,] m, string name, double number) =>
DoOperation(m, operations.TryGetValue(name, out var operation) ? operation : nothing, number);
public static double[,] DoOperation(this double[,] m, Func<double, double, double> operation, double number) {
if (m == null) throw new ArgumentNullException();
int rows = m.GetLength(0), columns = m.GetLength(1);
double[,] result = new double[rows, columns];
for (int r = 0; r < rows; r++) {
for (int c = 0; c < columns; c++) {
result[r, c] = operation(m[r, c], number);
}
}
return result;
}
public static void Print(this double[,] m) {
if (m == null) throw new ArgumentNullException();
int rows = m.GetLength(0), columns = m.GetLength(1);
for (int r = 0; r < rows; r++) {
Console.WriteLine("[ " + string.Join(", ", Enumerable.Range(0, columns).Select(c => m[r, c])) + " ]");
}
}
}
public class Program
{
public static void Main() {
double[,] matrix = {
{ 1, 2, 3, 4 },
{ 5, 6, 7, 8 },
{ 9, 10, 11, 12 }
};
double[,] tens = {
{ 10, 10, 10, 10 },
{ 20, 20, 20, 20 },
{ 30, 30, 30, 30 }
};
matrix.Print();
WriteLine();
(matrix = matrix.DoOperation("add", tens)).Print();
WriteLine();
matrix.DoOperation((a, b) => b - a, 100).Print();
}
}</lang>
{{out}}
<pre>
[ 1, 2, 3, 4 ]
[ 5, 6, 7, 8 ]
[ 9, 10, 11, 12 ]
[ 11, 12, 13, 14 ]
[ 25, 26, 27, 28 ]
[ 39, 40, 41, 42 ]
[ 89, 88, 87, 86 ]
[ 75, 74, 73, 72 ]
[ 61, 60, 59, 58 ]</pre>
=={{header|Clojure}}==
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