Vertical Line Test Calculator

Validate mathematical function coordinates

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Coordinate Points (x, y)

Enter one pair per line. Formats like 1, 2 or (1,2) are accepted.

Not a Function ❌

It fails the vertical line test. One or more X-values map to multiple different Y-values.

Violating X-Coordinates:

X = 1

These X-values split vertically into multiple points.

Parsed Points Count: 4

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About Vertical Line Test Calculator

In mathematics, the vertical line test visually or logically determines if a curve is a graph of a function. A function can only have one unique output (Y) for every input (X). Simply paste a list of (X, Y) coordinate points and the parser will instantly check for mapping collisions to tell you if it forms a function.

Vertical Line Test Calculator Features

Accepts bulk pasted coordinates
Identifies specific point violations
Flexible text parsing (comma separated, bracketed)

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