# Gr-Specest: window not passed? **URL:** \ **Category:** GNU Radio\ **Created:** [January 12, 2015, 3:18pm UTC](https://www.ruby-forum.com/t/gr-specest-window-not-passed/233789 "2015-01-12T15:18:17Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [January 12, 2015, 3:18pm UTC](https://www.ruby-forum.com/t/gr-specest-window-not-passed/233789/1 "2015-01-12T15:18:17Z")
Hello Moritz, Hello List, I might have found some unintended behaviour in gr-specest. I claim that the content of const std::vector &window is not passed in the constructor, if called by the GRC block. I cannot explain why and ask for hints on how to correct the behavior. I could supply a patch then. Consider the enclosed diff against the git version of lib/Welch\_impl.cc, which basically adds some debugging output. Running this with the original GRC block, I get the following output: Window created; size: 2048 (which is my FFT size) =\> the make(…int window\_type…) function works correctly specest\_check\_arguments\_impl::window.size() = 0 =\> this make(…, const std::vector &window) does not get the window’s values Constructor: 0 =\> the constructor(…, const std::vector &window) does not get the window’s values, either I suppose that this has something to do with the call-by-reference of const std::vector, but I cannot explain why. Can you confirm this behavior? Could you please help me finding a solution for this an let me fix it? Best regards Stephan Ludwig Robert Bosch GmbH Corporate Sector Research & Advance Engineering, Communication Technology (CR/AEH4) Renningen 70465 Stuttgart GERMANY > **[Want to know how to live #LikeABosch?](https://www.bosch.com/)** > > Moving stories and inspiring interviews. Experience the meaning of "invented for life" by Bosch completely new. Visit our international website. Tel. +49(711)811-8809 Fax +49(711)811-1052 Mobile +49(172)5630639 removed\_email\_address@domain.invalid Registered Office: Stuttgart, Registration Court: Amtsgericht Stuttgart, HRB 14000; Chairman of the Supervisory Board: Franz Fehrenbach; Managing Directors: Dr. Volkmar Denner, Dr. Stefan Asenkerschbaumer, Dr. Rolf Bulander, Dr. Stefan Hartung, Dr. Dirk Hoheisel, Christoph Kbel, Uwe Raschke, Wolf-Henning Scheider, Dr. Werner Struth, Peter Tyroller