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hy guys i have one question :) i have two vectors markets and price market <- c(1, 5, 7, 9, 9, 6, 5, 4, 4, 3, 1, 2, 1) price <- c(100, 20, 30, 10, 50, 23, 23, 33, 96, 6, 4, 38, 96) i would like sum prices: market 1: (100+4+96), market 2: (38),..., market 9: (10+50) ao i would like get this result: (200, 38, ..., 60) and i don't wanna use while, for loops... is there any other function

Hello, Thank you very much for quick response. I need only xapian-core. As I wrote on my case compilation with Visual Studio 2015 successful, just I have runtime errors, while the same code on LINUX runs fine. I'll try the hints from (https://trac.xapian.org/browser/git/xapian-core/INSTALL?rev=RELEASE/1.4#L54) and maybe to migrate my project to VS2017 and test it again. If I understand