question: public static void assertEquals ( String msg , double [ ] expected , double [ ] observed , double tolerance ) { StringBuilder out = new StringBuilder ( msg ) ; if ( expected . length != observed . length ) { out . append ( "\n Arrays not same length. \n" ) ; out . append ( "expected has length " ) ; out . append ( expected . length ) ; out . append ( " observed length = " ) ; out . append ( observed . length ) ; Assert . fail ( out . toString ( ) ) ; } boolean failure = false ; for ( int i = 0 ; i < expected . length ; i ++ ) { if ( ! Precision . equalsIncludingNaN ( expected [ i ] , observed [ i ] , tolerance ) ) { failure = true ; out . append ( "\n Elements at index " ) ; out . append ( i ) ; out . append ( " differ. " ) ; out . append ( " expected = " ) ; out . append ( expected [ i ] ) ; out . append ( " observed = " ) ; out . append ( observed [ i ] ) ; } } if ( failure ) { Assert . fail ( out . toString ( ) ) ; } }
target:  verifies that two arrays are close (sup norm) 