variable-length

Matrix of unknown length in MATLAB?

由 早过忘川 提交于 2019-11-26 08:03:20
I'm trying to set up a zero matrix of variable length with two columns into which I can output the results of a while loop (with the intention of using it to store the step data from Euler's method with adjusted time-steps). The length will be determined by the number of iterations of the loop. I'm wondering if there's a way I can do this while I'm running the loop or whether I need to set it up to begin with, and how to go about doing that. if the number of columns is fixed you can always add rows to your matrix (inside the loop) e.g. while (....) ..... new_row =[x y] ; % new row with values

Why aren't variable-length arrays part of the C++ standard?

由 断了今生、忘了曾经 提交于 2019-11-25 21:34:02
问题 I haven\'t used C very much in the last few years. When I read this question today I came across some C syntax which I wasn\'t familiar with. Apparently in C99 the following syntax is valid: void foo(int n) { int values[n]; //Declare a variable length array } This seems like a pretty useful feature. Was there ever a discussion about adding it to the C++ standard, and if so, why it was omitted? Some potential reasons: Hairy for compiler vendors to implement Incompatible with some other part of
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