mat2str到单元阵列的一般化 [英] Generalization of mat2str to cell arrays

问题描述

有时我会错过一个函数来生成(可能是嵌套的)单元格数组的字符串表示形式.这将是 mat2str 的概括，它仅适用于非单元格数组(数字，字符或逻辑类型.

I sometimes miss a function to produce a string representation of a (possibly nested) cell array. It would be a generalization of mat2str, which only works for non-cell arrays (of numeric, char or logical type).

给定一个数组x，如何获取字符串表示形式y，以便求值该字符串会产生x?

Given an array x, how to obtain a string representation y, such that evaluating this string produces x?

例如输入

x = {[10 20], {'abc'; false; true;}};

应该产生一个输出字符串，例如

should produce an output string like

y = '{[10 20], {''abc''; false; true}}';

(或有关分隔符的一些变化)，例如

(or some variation regarding spacing an separators), such that

isequal(x, eval(y))

是true.

推荐答案

此过程将数据结构转换为以后可以逃逸的字符串，命名为

This process, transforming a data structure into a string that later can be evaled, is named serialization.

有一个用于Octave的序列化功能，可用于此目的，它支持任何核心数据类型(不仅单元数组)具有任意数量的尺寸(不仅是2d).

There is a serialize function for Octave that can be used for this purpose which supports any core data type (not only cell arrays) with any number of dimensions (not only 2d).

示例:

## Works for normal 2d numeric arrays
octave> a = magic (4);
octave> serialize (a)
ans = double([16 2 3 13;5 11 10 8;9 7 6 12;4 14 15 1])
octave> assert (eval (serialize (a)), a)

## Works for normal 3d numeric arrays with all precision
octave> a = rand (3, 3, 3);
octave> serialize (a)
ans = cat(3,double([0.53837757395682650507 0.41720691649633284692 0.66860079620859769189;0.018390655109800025518 0.56538265981533797344 0.20709955358395887304;0.86811365238275806089 0.18398187533949311723 0.20280927116918162634]),double([0.40869259684132724919 0.96877003954154328191 0.32138458265911834522;0.37357584261201565168 0.69925333907961184643 0.10937000120952171389;0.3804633375950405294 0.32942660641033155722 0.79302478034566603604]),double([0.44879474273802461015 0.78659287316710135851 0.49078191654039543534;0.66470978375890155121 0.87740365914996953922 0.77817214018098579409;0.51361398808500036139 0.75508941052835898411 0.70283088935085502591]))
octave> assert (eval (serialize (a)), a)

## Works for 3 dimensional cell arrays of strings
octave> a = reshape ({'foo', 'bar' 'qux', 'lol', 'baz', 'hello', 'there', 'octave'}, [2 2 2])
a = {2x2x2 Cell Array}
octave> serialize (a)
ans = cat(3,{["foo"],["qux"];["bar"],["lol"]},{["baz"],["there"];["hello"],["octave"]})
octave> assert (eval (serialize (a)), a)

但是，更好的问题是为什么要首先这样做?如果您这样做的原因是要在多个Octave实例之间发送变量，请考虑使用 parallel 和<一个href ="http://octave.sourceforge.net/mpi/index.html"> mpi 软件包，这些软件包具有专门为此目的设计的功能.

However, a better question is why do you want to do this in the first place? If the reason you're doing this is to send variables between multiple instances of Octave, consider using the parallel and mpi packages which have functions specialized designed for this purpose.

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