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2012-07-12 06:58:12 +0200 | commented question | sage crashes while interpolating I didn't see your comment earlier. The binary version of sage was upgraded today and after this the problem i had was gone. Now however big the matrix is it doesn't crash. EDIT: It finally crashed again in sage 5.1 |

2012-07-11 09:29:36 +0200 | asked a question | sage crashes while interpolating I am running this command to interpolate the data contained in matrix(A). matrix(A) is 1800 x 3 dense matrix over Real Double Field. Sage crashes everytime i do this both in a quad core Amd with 8GB of ram(kubuntu 12.04 64bit, in both the binary and compiled from source versions) and a netbook Lenovo s9e with Intel Atom and 1GB of ram(kubuntu 12.04 32bit, binary version of sage).It returns this message: (more) |

2012-07-09 20:44:52 +0200 | received badge | ● Editor (source) |

2012-07-09 14:58:42 +0200 | asked a question | scipy.interpolate.interp2d multivariate interpolation and list alignement Given a set of (x[i],y[i],Value[i]) we can create a list or tuple and plot them with the command list_plot3d. In this way we take a 3d plot where in fact the z-axis corresponds to the value of an f(x,y). Instead of doing this, it appears that with scipy.interpolate.interp2d it is possible to avoid using the list_plot3d and create a contour-density kind of plot. As shown in the link it is feasible to do this but the fact is that it is too complicated to understand for a beginner like me. Is possible to explain this just to the simple point that someone takes the tuple and tries to create a contour-like plot?
It seems that the part of the code below is enough to make a contour plot: Notice on the second line that it refers to some data obviously given before this part of the code. I found out that for this code to work one has to have fully aligned data to feed to the code above. Example: If in any way the data that might be a tuple, or a list from what i understand, are not formatted as above, the code doesn't run. |

2012-07-07 18:07:06 +0200 | received badge | ● Supporter (source) |

2012-07-07 18:06:57 +0200 | commented question | Using solve() to find positive real solutions to a complex equation Is there any kind of workaround to at least remove automatically the complex solutions from the solutions so the don't mix with real roots? For example i was trying to make a list of real solutions of an equation and half of the list finally came out to be complex numbers. |

2012-07-06 14:54:10 +0200 | asked a question | generate_plot_points for multiple variable functions and contour_plot Is there a default sage function to generate all (x,y,f(x,y)) values the program uses to draw a multivariable function or the contours of let's say a f(x,y)=C ? I am new to sage and could only find that generate_plot_points works only for one variable functions. Example from documentation: I guess one could solve symbolically let's say a contour equation and then create the values i talk about like discussed here: then just plot each of those two above and combine them. But this could become really cumbersome since one could have a terribly complicated equation. So can this be done currently or someone needs a workaround to achieve this? excuse my english :) |

2012-07-05 03:39:03 +0200 | commented answer | get coordinates and function value as list Thank you for your reply. I think now i can make a more general question on the subject.When we ask sage to plot a function doesn't it replace (x,y) with values,it gets the values of the function and then plots it? Is there a way instead of asking from the program to plot the values it just calculated, to just create a list or some other construct with all the values (so that we don't have to create it ourselves each time)? Something like x_coordinates_column,y_coordinates_column,Function_value_column. Let's use this example: We have a f(x,y)=sin(x)*cos(y) and we want the contours sin(x)*cos(y)=k where k is a real number we can change as we like. I would like to have a consrtuct as described above with x_values,y_values,k. |

2012-07-04 16:32:33 +0200 | asked a question | get coordinates and function value as list I am quite new in sage as well as in programming, so please if you explain this, please do it thouroughly. Let's assume we have a simple function like F(x,y)=x+y. Is it possible to create a list, something like (x,y,F)? To make clearer a list in the form of (value_of_x_coordinate,value_of_y_coordinate,value_of_function) for instance (1,1,2) or (1,2,3). If this is possible, how can we transform the coordinates x,y by operating somehow on the list e.g adding on both x and y, a number N. |

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