# [SciPy-user] segfault in scipy.optimize.leastsq

Jelle Feringa / EZCT Architecture & Design Research jelle.feringa at ezct.net
Thu Aug 3 08:39:24 CDT 2006

```Any chance you have an older AMD processor perhaps not supporting SSE(3?)?

-----Original Message-----
From: scipy-user-bounces at scipy.org [mailto:scipy-user-bounces at scipy.org] On
Behalf Of basvandijk at home.nl
Sent: Thursday, August 03, 2006 3:12 PM
To: scipy-user at scipy.org
Subject: [SciPy-user] segfault in scipy.optimize.leastsq

Hello,

When running the following example from
http://www.tau.ac.il/~kineret/amit/scipy_tutorial I get an segmentationfault
in leastsq:

--------------------------
from scipy import *
from numpy import *

x = arange(0,6e-2,6e-2/30)
A,k,theta = 10, 1.0/3e-2, pi/6s
y_true = A*sin(2*pi*k*x+theta)
y_meas = y_true + 2*randn(len(x))

def residuals(p, y, x):
A,k,theta = p
err = y-A*sin(2*pi*k*x+theta)
return err

def peval(x, p):
return p[0]*sin(2*pi*p[1]*x+p[2])

p0 = [8, 1/2.3e-2, pi/3]
print array(p0)

from scipy.optimize import leastsq
plsq = leastsq(residuals, p0, args=(y_meas, x))
print plsq[0]

print array([A, k, theta])
--------------------------

Note that
C:\Python24\Lib\site-packages\scipy\optimize\tests\test_optimize.py also
gives an error.

I'm running Python 2.4.3, Scipy 0.5.0 and numpy 1.0b1.

What can be the problem?

Greetings,

Bas van Dijk
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