matlab - 用数字字符串快速填充元胞数组

Question

我想构建一个字符串元胞数组:{'x_1', 'x_2', ..., 'x_n'}。我提前知道 n 是什么。天真地，我可能会按如下方式构建此元胞数组:

for i = 1:n
    myCell{i} = sprintf('x_%d', i);
end

是否有更优雅的方式来做到这一点，即单行代码？

Answer 1

您的代码比提供的一些答案快三倍:

%
n = 1000;
tic
myCell = cell(1,n);
for i = 1:n
    myCell{i} = sprintf('x_%d', i);
end
toc

tic
aCell = arrayfun(@(x){sprintf('x_%d',x)},1:n);
toc

tic
bCell = strcat('x_',cellstr(num2str((1:n)')));
toc

tic
cCell = strcat('x_',strtrim(cellstr(num2str((1:n)'))));
toc



>> Elapsed time is 0.011541 seconds.
>> Elapsed time is 0.030992 seconds.
>> Elapsed time is 0.027931 seconds.
>> Elapsed time is 0.030453 seconds.