http://www.k-wave.org/forum/topic/shift-between-input-and-output Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 03:45:31 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/shift-between-input-and-output#post-5992 Mon, 19 Jun 2017 20:29:20 +0000 Bradley Treeby 5992@http://www.k-wave.org/forum/ <p>Hi Fan,</p> <p>I think dt/2 is correct (unless you can convince me otherwise). For example, in Eq. (2.17d), the right hand side (including the mass source) are at time point n + 1/2, while the time derivative on the left hand side is solved using a temporal staggered grid (with points at n and n + 1). The pressure is then updated, after which the sensor sampling occurs. Thus the source is added at n + 1/2, and sampled at n + 1, giving a half time-step offset between them.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/shift-between-input-and-output#post-5974 Sun, 04 Jun 2017 02:17:30 +0000 ZHANG Fan 5974@http://www.k-wave.org/forum/ <p>Hi everyone,</p> <p>I have a question. In the Sec.2.4 Table 2.1, it said that the outputs for both pressure and velocity are offset by △t/2 relative to the inputs. However, according to the discrete equations, I think it should be △t rather than △t/2. Could someone please help me confirm it?</p> <p>Thanks.</p> <p>Best,<br /> Fan </p>