Point query it initiates the search from an arbitrary triangle, say theįirst triangle in the array, and walks towards the triangle that encloses The point in an array with other points? When tsearch is called on a single So why theĭifferent outcome for the single point query versus the query that includes 3 collinear vertices) during the course of the search. Of the triangulation, or the algorithm may encounter a degenerate triangle The point that is causing problems may lie on the boundary If your data satisfies the requirements then the the problem is likely to beĪ numerical one. Sortware and these conditions are not met, then tsearch will not yield theĬorrect outcome and there are no checks within the software to warn you that If your triangulation is a mesh from third-party Have holes for example the type of triangulation that you create in MATLAB Tsearch will only work on Delaunay triangulations that are convex and do not The data you are working on, I can only speculate on the cause of the We are actively working on resolving these problems. We are aware of numerical problems that impact the robustness of tsearch and If anyone has any idea why this isn't working for me, I'd love to know! Tsearch(old_x_coord, old_y_coord, elements, new_x_coord(1733), new_x_coord(1733) That is, for point 1733 the tsearch failed. But there are inconsistencies when I try and pin them down. This in itself is not a problem, as long as I can identify which ones are wrong. However, because my domain shape changes, occasionally I get NaNs. So I would doĬontainingElement = tsearch(old_x_coord, old_y_coord, elements, new_x_coord, new_x_coord But there's a funny thing going on with tsearch. I'm trying to write some code that includes re-meshing a domain divided into triangular elements, so there is a point at which I know my new grid points and my old grid points, and I have to find which of the old elements each of the new points corresponds to. I am trying to calculate the energy loss of the material at each cycleīy calculating the area under the curve in Matlab. We tested it at different frequencies and graphed I have a data file with x and y coordinates (strain versus stress forĪ material I was testing). Inability to deal with c-style pointers from m-files and the penaltyĪnyone have a better method (than the mathworks have ) for reading/ So all in all the typecasting slowness seems a result of matlab's The mex mxCreateNumericMatrix and then leaves the actual typecasting When I look at the c source file I see that the function itselfĭoesn't do any typecasting, it just creates a relevant datatype with In the same private directory: typecastc.c It seems to be aįunction which is compiled from an accompying c file that is located The function that serves the typecast.m function is a mex file called To my surprise the typecast method is actually a _lot_ slower thanĬonsecutively using fread, on inspection the profiler shows that the Since the function isn't too fast I thought I'd read the entire fileĪt once as uint8 and then typecast byte by byte to the relevant Numbers per time in a complicated loop using fread. I have a function that reads large binary files by reading a couple of PREFDIR failed to create directory '/.matlab/mcr_v78/MAIN_'. Warning: failed to create preference directory /.matlab/mcr_v78/MAIN_Ĭheck directory permissions.? Error using => prefdir What can I do to avoid this warning short of changing the way in which I compile my code? Is there a preference file I should link to? "Warning: failed to create preference directory" error. Whenever my code is executed by the crontab process it encounters a Problem with "setpref" command in compiled code I have some compiled matlab code that is being executed by a crontab process and am encountering a problem with using the setpref command. I believe there is a better way to do this, but I couldn?t find it.Ĭould anyone give me some reference about that? Nowadyas I copy and paste each value and put in the right place of the tex file. Table in Latex I?d like to know how to create a latex table based in a matrix output calculated in matlab.
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