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Let a partition of a planar polygon into colored polygons be given, i.e. something similar to We know the coordinates...
Asked on 04/05/2021
1 answerI have an expression of the formop = a3 b2 c1 d0 - a2 b3 c1 d0 - a3 b1 c2 d0 + a1 b3 c2 d0 + a2...
Asked on 04/05/2021
1 answerIt might be a very basic question! Let say that I have an array of variables as the following x = {{x11, x12, x13, x14}, {x21, x22, x23, x24}, {x31,...
Asked on 04/05/2021
2 answerI want to plot the amplitude of a complex-valued function of one complex variable. I want to do this in the plane defined by the real and imaginary parts of...
Asked on 04/05/2021
2 answerThe Lotka-McKendrick model is a demographic model that represents the way a population changes over time due to fertility and mortality. For an age-specific population density $ u(a, t)...
Asked on 04/05/2021 by Pillsy
3 answerSay I generate a set of 20 random numbers by x=RandomReal[{0, 1}, 20], I want to compare every element of x with 0.4. If it is less than or equal...
Asked on 04/04/2021 by Leslie Chiu
3 answerBug introduced in 12.1.1 or earlier - Fixed in Version: 12.2.0 Suppose you have the DE $$frac{d}{dx} left(c(x) left[frac{d}{dx}u(x)right]right) + n(x) = 0$$ and you...
Asked on 04/04/2021 by Mauricio Fernández
4 answerIf I have an list of numbers {1, 2, 4, 70, 11, 20, 56, 79}, is there a way to remove the list {2, 4, 56} from that list? In...
Asked on 04/04/2021
1 answerThe following code works for matrices without row/column headings and I like to carry out the aggregation of the selected rows and columns by keeping row/column headings.ClearAll[mat2, aggregationSUM, aggmat];aggregationSUM...
Asked on 04/04/2021
1 answerI'm working with the code below, which works well for my purposes; however, instead of the canonical ordering seen in the output, I want the output produced in the...
Asked on 04/04/2021 by PRG
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