python scipy sparse matrix SVD with error ARPACK error 3: No shifts could be applied during a cycle of the Implicitly restarted Arnoldi iteration -

-

i using scipy sparse matrix svd on large data. matix around 200,000*8,000,000 size, 1.19% non-zero entries. machine using has 160g memory suppose memory shouldn't issue.

so here code used:

from scipy import * scipy.sparse import * import scipy.sparse.linalg slin numpy import * k=1500 coom=coo_matrix((value,(row,col)),shape=(m,n)) coom=coom.astype('float32') u,s,v=slin.svds(coom,k,ncv=8*k)

the error message like:

traceback (most recent call last):   file "sparse_svd.py", line 35, in <module>     u,s,v=slin.svds(coom,k,ncv=2*k+1)   file "/usr/lib/python2.7/dist-packages/scipy/sparse/linalg/eigen/arpack/arpack.py", line 731, in svds     eigvals, eigvec = eigensolver(xh_x, k=k, tol=tol**2)   file "/usr/lib/python2.7/dist-packages/scipy/sparse/linalg/eigen/arpack/arpack.py", line 680, in eigsh     params.iterate()   file "/usr/lib/python2.7/dist-packages/scipy/sparse/linalg/eigen/arpack/arpack.py", line 278, in iterate     raise arpackerror(self.info) scipy.sparse.linalg.eigen.arpack.arpack.arpackerror: arpack error 3: no shifts applied during cycle of implicitly restarted arnoldi iteration. 1 possibility increase size of ncv relative nev.

when k=1000 (i.e. #eigen values=1000) ok. when try k>=1250 error begins appear. have tried various ncv values, still same error message...

any suggestions , appreciated. lot :)


Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more