Problem 381. Angle between two vectors

Created by Aurelien Queffurust

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You have two vectors , determine the angle between these two vectors

For example:

u = [0 0 1];
v = [1 0 0];

The angle in degrees between u and v is 90.

Solve

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Last Solution submitted on Apr 07, 2025

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David Young on 22 Feb 2012

It would be good to have a more challenging test suite - see the guidelines for problems. Some solvers write code that is just a lookup table for the test cases, and having only one case makes it trivial to do this.

Rick Rosson on 25 Feb 2012

Also, your test should not use string comparison to evaluate what is a purely numerical computation. It would be better if you subtracted the correct answer from the proposed answer, and then compared the absolute value to a am all threshold, such as 1e-6.

Aurelien Queffurust on 2 Mar 2012

Thnaks for your comments. It was my first or second problem sent to CODY. I didn't catch all the tricks to make strong test cases yet.

Aurelien Queffurust on 11 Jun 2012

I have rescored the problem after adding more robust test suites.

Ashutosh datar on 8 Jul 2013

only one test case runs, others are not working

Brian Holden on 12 Jan 2024

I don't understand why the checker is rounding the answers, nor why some implementers are rounding the answers. Maybe it's to avoid roundoff issues, which admittedly are an issue when testing equivalence, but any reasonable solution to the problem should be able to give an answer out to 5 or 6 decimal places.

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Problem 381. Angle between two vectors

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Problem 381. Angle between two vectors

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