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simpsons fix

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This commit is contained in:
Martin Vrhovšek 2025-02-20 22:53:04 +01:00
parent 14a0678835
commit 5dad6632aa
1 changed files with 9 additions and 7 deletions
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16
src/main.zig
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@ -25,6 +25,8 @@ pub fn main() !void {
plotGraph(); plotGraph();
drawAxis(); drawAxis();
try markAxis(allocator); try markAxis(allocator);
const area = try simpsonsRule(-5, 5, 1000000);
try displayAreaSize(area);
rl.endDrawing(); rl.endDrawing();
} }
@ -125,7 +127,7 @@ fn plotGraph() void {
// f(x) // f(x)
fn getY(x: f32) !f32 { fn getY(x: f32) !f32 {
return try math.calculate(x, 2, .Power) / -2 + 6; return try math.calculate(x, 2, .Power);
} }
fn adjustForGridSystem(input_vector: rl.Vector2) rl.Vector2 { fn adjustForGridSystem(input_vector: rl.Vector2) rl.Vector2 {
@ -139,11 +141,11 @@ fn adjustForGridSystem(input_vector: rl.Vector2) rl.Vector2 {
return new_vector; return new_vector;
} }
fn calculateArea(val: f32) !void { fn displayAreaSize(val: f32) !void {
var buf: u8[20] = undefined; var buf: [20]u8 = undefined;
const txt = try std.fmt.bufPrintZ(&buf, "{}", .{val}); const txt = try std.fmt.bufPrintZ(&buf, "{}", .{val});
rl.drawText(txt, SCREENWIDTH - 75, 25, 20, rl.Color.red); rl.drawText(txt, SCREENWIDTH - 150, 25, 20, rl.Color.red);
} }
const SimpsonsError = error{ const SimpsonsError = error{
@ -155,17 +157,17 @@ fn simpsonsRule(start: f32, end: f32, n: usize) !f32 {
const h = (end - start) / @as(f32, @floatFromInt(n)); const h = (end - start) / @as(f32, @floatFromInt(n));
var sum: f32 = getY(start) + getY(end); var sum: f32 = try getY(start) + try getY(end);
var i: usize = 1; var i: usize = 1;
// we iterate through amount of subintervals // we iterate through amount of subintervals
while (i < n) : (i += 1) { while (i < n) : (i += 1) {
// calculate x of the slice we're adding (start + ) // calculate x of the slice we're adding (start + )
const x = start + i * h; const x = start + @as(f32, @floatFromInt(i)) * h;
// determine weights 4 for odd, 2 for even // determine weights 4 for odd, 2 for even
sum += if (x % 2 == 0) 2 * getY(x) else 4 * getY(x); sum += if (@mod(i, 2) == 0) 2 * try getY(x) else 4 * try getY(x);
} }
return (h / 3.0) * sum; return (h / 3.0) * sum;