基于Matlab计算的KMV模型在中国上市公司信用风险的度量研究_论文_百度文库
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基于Matlab计算的KMV模型在中国上市公司信用风险的度量研究
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Matlab的工具箱中提供了Bloomberg和Yahoo等数据接口，用于提取上市公司的行情数据，其实这些接口都是通过HTTP协议通信的，并且yahoo的接口是直接从yahoo门户网站提取的，只是需要在matlab端对htm进行解析。其核心主要是使用了Matlabd的urlread函数，那么通过该函数我们也可以从网络获取各种数据。
当前很多网站特别是社交网站都提供了API，供第三方开发，并且数据格式一般都支持XML和JSON两种，因此如果在matlab下面提取这样的数据的话，就需要对XML和JSON进行解析，这里有一个JSON的解析库：。下面我们编写一个简单的fetch函数，来从一个URL中获取数据，该数据的格式为JSON。
function output = fetch(url, varargin)
if nargin & 2
% to do sth.
pattern = varargin{1};
if ~ischar(pattern)
error('XXXX:InvalidParameter', 'The parameter pattern must be str.');
[json, status] = urlread(url, 'get', {'key', urlencode(pattern)});
if status == 1
output = parse_json(json);
catch exception
error('XXXX:InvalidJson', 'Request succussfuly! but the result is not valid json string.');
error(['Cant connect the site &' url ...
'&, or connect timeout. If you connect internet with proxy, you should set the proxy server manually, see alse /help/techdoc/matlab_env/bq37bb3-1.html#bq37bb3-3']);
主要代码就是：
[json, status] = urlread(url, 'get', {'key', urlencode(pattern)});
urlencode是对URL中的非ASCII吗字符进行编码。json为返回的JSON数据，status表示请求的结果状态，当status为1时表示获取数据成功，然后通过：
output = parse_json(json);
来将JSON格式转换成Matlab的数据类型。
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(简体中文)拍一张照片，能在matlab 上识别出照片里物体的尺寸吗？ - Matlab论坛 -
中国电子技术论坛 -
最好最受欢迎电子论坛!
后使用快捷导航没有帐号？
拍一张照片，能在matlab 上识别出照片里物体的尺寸吗？
16:07:02　　
例如，我拍一个圆，能在MATLAB上算出它的实际半径和圆心坐标吗？
22:18:25　　
要有参照比例的，你照时的焦距不同，那实际大小在照片上的大小也不同，焦距要告诉matlab
等待验证会员
14:15:39　　
可以的 matlab可以进行边缘检测 和轮廓检测 而且自带求轮廓面积的函数
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