I have a large CSV file (~1gb) with mixed data. Basically with strings and integers. It takes very long to import this whole dataset with Import[] so I would like to use ReadList. A line contains of {int, string, string, string, int, int, string, int, string, string, int, int, int (or NaN), int (or NaN), string}. These entries are separated by commas. The tricky part is that some of the strings may contain commas as well, but are then enclosed by double quotes. Is there a way I can accomplish reading this correctly with ReadList?
I have a list of 4D data (x position, y position, amplitude, wavelength). I want to plot x, y, and amplitude on a 3D plot and have the color of the points correspond to the wavelength. I have seen many examples using functions to define color but my wavelength cannot be expressed by an analytic function. Is there a simple way to do this? Answer Here a another possible way to visualize 4D data: data = Flatten[Table[{x, y, x^2 + y^2, Sin[x - y]}, {x, -Pi, Pi,Pi/10}, {y,-Pi,Pi, Pi/10}], 1]; You can use the function Point along with VertexColors . Now the points are places using the first three elements and the color is determined by the fourth. In this case I used Hue, but you can use whatever you prefer. Graphics3D[ Point[data[[All, 1 ;; 3]], VertexColors -> Hue /@ data[[All, 4]]], Axes -> True, BoxRatios -> {1, 1, 1/GoldenRatio}]
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