起因
由于matlab中不存在科学计数法来表示一个数字，因此为了将例如1234567这个数字转换为1.234567M，需要自己实现一个装饰器，将其应用到fprintf函数中。
实现方式
代码如下
function outFunction = fprintfSciDecorator(inFunction)
% Usage:
% fprintfSci = fprintfSciDecorator(@fprintf);
% fprintfSci(' Freq = %sHz\n', 123456789);
arguments
inFunction (1,1) function_handle
end
outFunction = @(varargin) decorate(inFunction, varargin{:});
function varargout = decorate(fun, varargin)
ins = cell(1, numel(varargin));
ins{1} = varargin{1};
for index = 2:numel(varargin)
unit_num = varargin{index};
if unit_num < 1e-21
ins{index} = [num2str(unit_num/1e-21, 5), 'y '];
elseif unit_num >= 1e-21 & unit_num < 1e-18
ins{index} = [num2str(unit_num/1e-21, 5), 'z '];
elseif unit_num >= 1e-18 & unit_num < 1e-15
ins{index} = [num2str(unit_num/1e-18, 5), 'a '];
elseif unit_num >= 1e-15 & unit_num < 1e-12
ins{index} = [num2str(unit_num/1e-15, 5), 'f '];
elseif unit_num >= 1e-12 & unit_num < 1e-09
ins{index} = [num2str(unit_num/1e-12, 5), 'p '];
elseif unit_num >= 1e-09 & unit_num < 1e-06
ins{index} = [num2str(unit_num/1e-09, 5), 'n '];
elseif unit_num >= 1e-06 & unit_num < 1e-03
ins{index} = [num2str(unit_num/1e-06, 5), 'u '];
elseif unit_num >= 1e-03 & unit_num < 1e00
ins{index} = [num2str(unit_num/1e-03, 5), 'm '];
elseif unit_num >= 1e00 & unit_num < 1e03
ins{index} = [num2str(unit_num/1e00, 5), ' '];
elseif unit_num >= 1e03 & unit_num < 1e06
ins{index} = [num2str(unit_num/1e03, 5), 'k '];
elseif unit_num >= 1e06 & unit_num < 1e09
ins{index} = [num2str(unit_num/1e06, 5), 'M '];
elseif unit_num >= 1e09 & unit_num < 1e12
ins{index} = [num2str(unit_num/1e09, 5), 'G '];
elseif unit_num >= 1e12 & unit_num < 1e15
ins{index} = [num2str(unit_num/1e12, 5), 'T '];
elseif unit_num >= 1e15 & unit_num < 1e18
ins{index} = [num2str(unit_num/1e15, 5), 'P '];
elseif unit_num >= 1e18 & unit_num < 1e21
ins{index} = [num2str(unit_num/1e18, 5), 'E '];
elseif unit_num >= 1e21 & unit_num < 1e24
ins{index} = [num2str(unit_num/1e21, 5), 'Z '];
else
ins{index} = [num2str(unit_num/1e21, 5), 'Y '];
end
end
[varargout{1:nargout}] = fun(ins{:});
end
end
当使用的时候，首先需要进行声明。
fprintfSci = fprintfSciDecorator(@fprintf);
然后再按照fprintf的方式正常调用即可。
fprintfSci(' Freq = %sHz\n', 123456789);