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5b4759bd3c
Use a rectangular matrix instead of a square one to distinguish rows and columns more clearly. Extend the example with row access.
33 lines
969 B
Zig
33 lines
969 B
Zig
const std = @import("std");
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const expect = std.testing.expect;
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const expectEqual = std.testing.expectEqual;
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const mat4x5 = [4][5]f32{
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[_]f32{ 1.0, 0.0, 0.0, 0.0, 0.0 },
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[_]f32{ 0.0, 1.0, 0.0, 1.0, 0.0 },
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[_]f32{ 0.0, 0.0, 1.0, 0.0, 0.0 },
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[_]f32{ 0.0, 0.0, 0.0, 1.0, 9.9 },
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};
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test "multidimensional arrays" {
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// mat4x5 itself is a one-dimensional array of arrays.
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try expectEqual(mat4x5[1], [_]f32{ 0.0, 1.0, 0.0, 1.0, 0.0 });
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// Access the 2D array by indexing the outer array, and then the inner array.
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try expect(mat4x5[3][4] == 9.9);
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// Here we iterate with for loops.
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for (mat4x5, 0..) |row, row_index| {
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for (row, 0..) |cell, column_index| {
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if (row_index == column_index) {
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try expect(cell == 1.0);
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}
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}
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}
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// Initialize a multidimensional array to zeros.
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const all_zero: [4][5]f32 = .{.{0} ** 5} ** 4;
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try expect(all_zero[0][0] == 0);
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}
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// test
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