René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Wrong element_solid_history_variables after updating  from 2.0.3 to 2.0.4","articleBody":"**🐛 Describe the bug**\nHistory variables of solid elements are incorrect. The same script produced correct results with lasso 2.0.3 version. Updating to 2.0.4 was necessary due to bug when using buffered reading.\n\n**🔢 To Reproduce**\nd3plot of simulation with MAT224 and extended binary output, where elements are failing.\nAnalyzing history of failed elements:\n\n#get part filter\nmask = d3plot.get_part_filter(\n            FilterType.SOLID, [part_id]\n        )\n#get array of alive/failure state of elements\nalive = d3plot.arrays[ArrayType.element_solid_is_alive][:, mask]\n#Create a boolean mask where True indicates failure\nfailure_mask = ~alive.astype(bool)\n#get all elements that are deleted at the end of the simulation\nfailed_elements = np.where(failure_mask[-1])[0]\n#get history values of all failed elements\nhist_failed = np.squeeze(\n            d3plot.arrays[ArrayType.element_solid_history_variables][\n                :, mask\n            ][:, failed_elements]\n        )\n\n--\u003e History values are wrong. e.g. history variable 12 (index 11) is a \"damage\" variable which is defined to be between 0 and 1, however it has negative values according to the hist_failed array\n\n**💘 Expected behavior**\nHistory variables are correctly read by lasso\n\n**📷 Screenshots**\nhere is an array of all history values of a single element at a specific timestep. Obviously, the damage (index 11) is negative: \n\n[ 0.00000000e+00  3.43736880e-01 -1.96636388e-02  4.72120359e-03\n  4.42427426e+02  7.03701697e-01  7.90452099e-02  2.00001989e+01\n -1.69087653e-01  2.24070862e-03  1.67009592e-01 -1.34268094e-04\n  8.41131945e-05 -2.84149433e-01]\n\n**🖥️ Setup**\n - lasso-python version: 2.0.4\n - OS: Linux\n","author":{"url":"https://github.com/mwmmr","@type":"Person","name":"mwmmr"},"datePublished":"2026-02-09T15:51:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/99/lasso-python/issues/99"}