diff --git a/plot.ts b/plot.ts
index 46bddc3..b47c947 100644
--- a/plot.ts
+++ b/plot.ts
@@ -9,7 +9,7 @@ export const plot = (data) => {
 }
 
 export const plotxy = (xmin, xmax, step, y) => {
-  const x = Array.from({length: (xmax - xmin)/step}, (_, i) => (i + xmin) * step)
+  const x = Array.from({length: (xmax - xmin)/step}, (_, i) => i * step + xmin)
   const data = x.map(x => ({x, y: y(x)}))
   return Plot.line(data, {x: "x", y: "y"}).plot({y: {grid: true}, document})
 }
\ No newline at end of file