From: rafael.soares81@... Date: 2016-05-06T23:51:54+00:00 Subject: [ruby-core:75394] [Ruby trunk Bug#12356] Vector covector incorrect multiplication with another vector. Issue #12356 has been reported by Rafael Silva. ---------------------------------------- Bug #12356: Vector covector incorrect multiplication with another vector. https://bugs.ruby-lang.org/issues/12356 * Author: Rafael Silva * Status: Open * Priority: Normal * Assignee: * ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-linux] * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN ---------------------------------------- Version 2.2.4 v1 = Vector[2,3,4] v2 = Vector[4,5,6] v1.covector.row_size #1 v1.covector.column_size #3 v2.covector.row_size #1 v2.covector.column_size #3 Vector does not have distinction between row and column, there's no column vector notion in the language. v1 * v2.covector #Matrix[[8,10,12],[12,15,18],[16,20,24]] # Should be illegal. But works like if v2.covector is transposed / column vector which it's clearly not. v1.covector * v2.covector #ExceptionForMatrix::ErrDimensionMismatch: Matrix dimension mismatch # Expected v1 * v2 #ExceptionForMatrix::ErrOperationNotDefined: Operation(*) can't be defined: Vector op Vector # No comments, see my observation below. v1.covector * v2 #Vector[47] #Again covector treated like transposed / column vector. Personal observation: Terrible choice to represent Vector like an Array, Vector should be a shortcut to Matrix. -- https://bugs.ruby-lang.org/ Unsubscribe: