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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Copy function","articleBody":"Hi @tzikis and @eecharlie\r\n\r\nI've been playing around with the MatrixMath library, and I have a very specific issue with the **Copy** function, which is giving me a huge headache:\r\n\r\nHere is a minimal example:\r\n\r\n ```\r\n   float X[10][40][3];    //an array of 10 matrices (40x3)\r\n    \r\n    //just fill it with 5's:\r\n    for(int i=0; i\u003c10; i++){\r\n        for (int j=0; j\u003c40; j++){\r\n            for (int k=0; k\u003c3; k++){\r\n                X[i][j][k] = 5.0;\r\n            }\r\n        }\r\n    }    \r\n\r\n    float Q [10][40][3];    \r\n    \r\n   //now, I just want to copy the 1st matrix of X (located in X[0]) to Q[0]:\r\n    Matrix.Copy( (float*)X[0], 3, 40, (float*)Q[0] );\r\n    Serial.println(\"Copy done\");\r\n```\r\n\r\nWhile the compiler doesn't complain about this code, the program segfaults after the copy operation... \r\nCan you perhaps let me know why, and how can I solve this?\r\n\r\nI also noticed that the Copy function receives n (cols) first and m (rows) after, as opposed to all the other functions in the library. Do you know the reason for this design choice? I would recommend to change the order for easiness of use.\r\n\r\nThanks!","author":{"url":"https://github.com/davidbsp","@type":"Person","name":"davidbsp"},"datePublished":"2018-01-11T14:00:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/1/MatrixMath/issues/1"}