Question

我想在MATLAB中编写一个代码，将一个字母转换为NATO字母表。例如“＆strong> hello ＆＃39;将被重写为 Hotel-Echo-Lima-Lima-Oscar 。我在代码方面遇到了一些麻烦。到目前为止，我有以下内容：

function natoText = textToNato(plaintext)
plaintext = lower(plaintext);
r = zeros(1, length(plaintext))

%Define my NATO alphabet
natalph = ["Alpha","Bravo","Charlie","Delta","Echo","Foxtrot","Golf", ...
    "Hotel","India","Juliet","Kilo","Lima","Mike","November","Oscar", ...
    "Papa","Quebec","Romeo","Sierra","Tango","Uniform","Victor",...
    "Whiskey","Xray","Yankee","Zulu"];

%Define the normal lower alphabet
noralpha = ['a' : 'z'];

%Now we need to make a loop for matlab to check for each letter
for i = 1:length(text)
    for j = 1:26
        n = r(i) == natalph(j);
        if noralpha(j) == text(i) : n
        else r(i) = r(i)
            natoText = ''
        end
    end
end

for v = 1:length(plaintext)
    natoText = natoText + r(v) + ''
    natoText = natoText(:,-1)
end
end

我知道上面的代码是一团糟，我有点怀疑我一直在做什么。有谁知道更好的方法吗？我可以修改上面的代码以使其有效吗？

因为现在当我运行代码时，我得到一个空的情节，我不知道为什么，因为我没有要求任何一行的情节。

Answer 1

您实际上可以在一行中进行转换。鉴于您的string array natalph：

plaintext = 'hello';  % Your input; could also be "hello"
natoText = strjoin(natalph(char(lower(plaintext))-96), '-');

结果：

natoText = 

  string

    "Hotel-Echo-Lima-Lima-Oscar"

这使用了一种技巧，即字符数组可以被视为其ASCII equivalent值的数字数组。代码char(lower(plaintext))-96将plaintext转换为lowercase，然后转换为character array（如果尚未转换）并通过减去96将其隐式转换为ASCII值的数值向量由于'a'等于97，因此会创建一个包含值1（'a'）到26（'z'）的索引向量。这用于索引字符串数组natalph，然后这些是带有连字符的joined together。

在MATLAB中将字母转换为NATO字母表

1 个答案: