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| L = {{1, 0, 0, 0}, {3, 1, 0, 0}, {2, 4, 1, 0}, {5, 2, 3, 1}} U = {{1, 9, 7, 5}, {0, 1, 8, 5}, {0, 0, 1, 2}, {0, 0, 0, 1}} L*U {{1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}} This is the result that give me in the other... |
| ParametricPlot3D[{2 cos [u], 2 sin [u], v}, {u, 0, 2 \[Pi]}, {v, 0, 6}] I try to plot and only appear the space but no the graphic, help me! ![enter image description here][1] [1]:... |