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replace ANN by kdtree. hi See merge request !12
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implementing finding eigenvalue and eigenvector for 3x3 matrix. hi, I implemented the eigenvalue and eigenvector as well as the variance tensor part. Fixed some minor error in matrix_sym.h when using in cooperating with matrix.h. See merge request !11
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fix some minor errors. fix minor error when using it in cooperating with function mat() from class matrix_sym! See merge request !10
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made code more elegant. Hi, this is jack I've already made some changes on the code. See merge request !9
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…s. Fixed minor errors in the grids and image stack classes
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added Jack's KD-Tree code Hi, I just fixed all of the KD tree changes and they're ready to merge. See merge request !8
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added support for Wei's SPE files See merge request !7
