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• nginx: how do I track down a random 500 from nginx (not my application). Potentially has something to do with load?

  - by kaleidomedallion

  We recently had some 500's from nginx itself that somehow were not logged (we have screenshots, but nothing in the logs). That is weird in itself, because usually errors show up there. Regardless, I am wondering if there is something like a connection pool size that if maxed out would result in a 500? We have correlated it potentially to a recent spike in traffic, but it is not conclusive. Anyone have any ideas of how to begin to approach such an issue?

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• What is the best resource or method for learning more about servers and networking?

  - by kaleidomedallion

  I can get around a server to some degree, but everything I have learned has been as I have needed to learn it. Every once in a while I will learn about some new command that will revolutionize how I think about systems and networking, and realize how I could have been using it this whole time if only I had known about it. Anything to bring someone from novice to some kind of fluency? Do I just need to earn the battle scars bit by bit over the course of years? (I mean of course I do but what can I do to help it be not quite so painful?) For instance, I am still fuzzy on all of networking. Any help would be greatly appreciated.

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• Setting an class attribute with a given name in python while defining the class

  - by kaleidomedallion

  I am trying to do something like this: property = 'name' value = Thing() class A: setattr(A, property, value) other_thing = 'normal attribute' def __init__(self, etc) #etc.......... But I can't seem to find the reference to the class to get the setattr to work the same as just assigning a variable in the class definition. How can I do this?

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• In matlab, how do I apply a function of two arguments to two cellarrays of equal length?

  - by kaleidomedallion

  So I have two cell arrays: A = {2 2 2 2} B = {[1 2] [3 2] [5 5] [7 7]} and a function of two arguments: F = @(a, b) [a * b(1), (b(2) / 3), (b(1) + a) * 22] And I want to apply the function to the two cell arrays like so: idealfun(F, A, B) and have it do the right thing (return a cell array with four cells of 1x3 vectors). Any ideas how to find/write idealfun?

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• If a Matlab function returns a variable number of values, how can I get all of them as a cellarray,

  - by kaleidomedallion

  I am writing a function to remove some values from a cellarray, like so: function left = remove(cells, item); left = cells{cellfun(@(i) ~isequal(item, i), cells)}; But when I run this, left has only the first value, as the call to cells{} with a logical array returns all of the matching cells as separate values. How do I group these separate return values into a single cellarray? Also, perhaps there is already a way to remove a given item from a cellarray? I could not find it in the documentation.

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