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2013-04-28 20:23:36 +0200 | asked a question | Numerical integral with multiple parameters I am trying to numerically integrate a function with respect to one variable, although the function is of more than one variable. An example: produces the correct result of 1/2*a Errors with "ValueError: Maxima (via quadpack) cannot compute the integral", but I probably don't have the syntax correct even if that function can do this. Even if a is given a value prior to the g(x,a) definition, it doesn't work. Errors with "ValueError: Integrand has wrong number of parameters". I can understand this, as it doesn't quite know what to do with 'a'. Gives an incorrect result of 0.3333 Gives the correct result of 2.99996 Gives the correct result of 3 What is going on with g(x,a) and the "params" vector? Is what I am attempting to do possible? I would like to make a plot of g(x,a) across a range of a. This is a simplified example, where I could obviously just do it by hand or with a non-numerical integral. The f(x,a) that I am really trying to work with is much more complex. I can upload a .sws workbook with these equations if that helps. The documentation at http://www.sagemath.org/doc/reference/calculus/sage/gsl/integration.html don't give much to go on with respect to params or nintegral. Any other docs out there I am missing? |

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2013-04-20 20:02:56 +0200 | answered a question | Running octave from the sage notebook Similar to above, the following worked for me from the notebook interface of sage: Octave was installed on my system using MacPorts. I found that otherwise it errored with "ValueError: The octave session in which this object was defined is no longer running." Note: octave.eval returns a string, usually with "ans =", whereas octave() returns a number that I could perform further operations on. You may want to put octave.quit(True) at the end. I don't understand what is actually going on well, so take my advice with caution. see also: http://www.sagemath.org/doc/reference/interfaces/sage/interfaces/octave.html |

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