k-Wave User Forum » Topic: spectrum function error in ultrasound beam patterns example.

k-Wave User Forum » Topic: spectrum function error in ultrasound beam patterns example. http://www.k-wave.org/forum/topic/spectrum-function-error-in-ultrasound-beam-patterns-example Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:34:30 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://www.k-wave.org/forum/search.php acegi70 on "spectrum function error in ultrasound beam patterns example." http://www.k-wave.org/forum/topic/spectrum-function-error-in-ultrasound-beam-patterns-example#post-469 Fri, 20 Apr 2012 01:36:06 +0000 acegi70 469@http://www.k-wave.org/forum/ Hi Brad, Great. It works now! Thank you very much for your quick reply. Jun Bradley Treeby on "spectrum function error in ultrasound beam patterns example." http://www.k-wave.org/forum/topic/spectrum-function-error-in-ultrasound-beam-patterns-example#post-468 Fri, 20 Apr 2012 01:02:29 +0000 Bradley Treeby 468@http://www.k-wave.org/forum/ Hi acegi70, This error appears to come from a naming conflict between the <code>spectrum</code> function in the k-Wave toolbox, and the <code>spectrum</code> function in the signal processing toolbox. We'll consider changing the name for future releases, but as a work around you could try either: (1) Renaming the <code>spectrum</code> function in the toolbox to <code>kspectrum</code>, and then changing the line of the code in the example to call <code>kspectrum</code> instead. (2) Copying the <code>spectrum.m</code> file into the examples folder to see if that forces the k-Wave function to take precedence. I hope you can get it working! Brad. acegi70 on "spectrum function error in ultrasound beam patterns example." http://www.k-wave.org/forum/topic/spectrum-function-error-in-ultrasound-beam-patterns-example#post-467 Fri, 20 Apr 2012 00:06:02 +0000 acegi70 467@http://www.k-wave.org/forum/ Hi, I just found out about k-wave and am just trying to learn it by looking at some of the examples on my mac OsX Lion. One thing I looked into was the "Simulating ultrasound beam patterns" example. If I run this, it works fine. However, I wanted to look at the fundamental and harmonic beam profiles and so I set USE_STATISTICS = fase; and ran the example again. Doing this gave me an error message as shown below: Warning: SPECTRUM is obsolete and will be removed in future versions. Use the spectrum objects instead, type "help SPECTRUM". > In spectrum at 103 Warning: Rounding order to nearest integer. > In signal/private/check_order at 28 In hanning at 25 In spectrum>specchk at 321 In spectrum at 106 Error using spectrum>specchk (line 398) Requires positive integer values for NFFT and NOVERLAP. Error in spectrum (line 106) [x,y,nfft,noverlap,window,Fs,p,dflag]=specchk(varargin); It seems that the error is generated by the "spectrum" function and I was wondering if anyone could suggest how to go about fixing this issue. Thank you.