数模问题求助！！
模拟光电管的特性曲线，这是其中的一组数据x=-1:1:50;
y=;
http://b79.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1a15bc460d1ce11f0a514db327ced1cc2b0ab1d9b564f6a11a0bfb7030cbb90dab5abe335a15c1a2317f5a31e9a7e24e7cb522e53d7c5d791b999e99d3135bc291b91800c341381866590b83aa5a063f67119f43&a=79&b=79
用什么样的曲线或函数来模拟才能使向后沿拓后像完整的光电管的伏安特性曲线？
就像下面的图那样
http://b69.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1a15bc460d1ce11f0a514db327ced1cccd48af046cd933be06f293cc498e03f6feeeb94615fff93fb0158414236547fe966084dd85c30b603b36fcc2535940b621ceac5b6829c0d516863ad3ea19c0b8676e9c8e&a=69&b=69
或者像这样的也行
http://b77.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1a15bc460d1ce11f0a514db327ced1cc5a2b8b6f89bd616736fd513747c426c61c50733ebdcc0c4d2dc1824aeb8410a7adea9bdc685f4227329aa61da80fe83b9f80c438f96f01618d63f8a3ccfe1e8aa280db40&a=77&b=77
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