拟合曲线并在Matlab中进行插值

Question

我有一个数据集，我想要拟合一条曲线。原始数据集包含3500到4100之间的值，步长为1.67。然后我想使用拟合曲线并找到一些其他x2值的y2值（例如300多个x2数据）。我怎么能在matlab中做到这一点？

Answer 1

由于您的绘图看起来像一个简单的线性插值，您可以使用

fitfun(x)

定义函数x2。然后用你的新newy2=fitfun(newx2); 值调用这个函数，我认为它应该直接与数组一起工作（结果将是一个相同大小的数组）：

x2

注意边界：插值不能给你NaN设置的域外的点，除非你告诉它说什么（默认的越界值是<div class="container"> <div class="row"> <div class="col-xs-6 col-xs-12 col-md-3"> <div class="thumbnail"> <img src="http://i.imgur.com/OcrRV00.jpg" alt="photogenic kitten"> <div class="caption"> <h3>The cutest kitten in the world has no time for bubbles.</h3> <p>What...</p> <p><a href="#" class="btn btn-primary" role="button">Pet him</a> <a href="#" class="btn btn-default" role="button">Don't pet him</a> </p> </div> </div> </div> <div class="col-xs-6 col-xs-12 col-md-3"> <div class="thumbnail"> <img src="http://i.imgur.com/OcrRV00.jpg" alt="photogenic kitten"> <div class="caption"> <h3>The cutest kitten in the world has no time for bubbles.</h3> <p>What...</p> <p><a href="#" class="btn btn-primary" role="button">Pet him</a> <a href="#" class="btn btn-default" role="button">Don't pet him</a> </p> </div> </div> </div> <div class="col-xs-6 col-xs-12 col-md-3"> <div class="thumbnail"> <img src="http://i.imgur.com/OcrRV00.jpg" alt="photogenic kitten"> <div class="caption"> <h3>The cutest kitten in the world has no time for bubbles.</h3> <p>What...</p> <p><a href="#" class="btn btn-primary" role="button">Pet him</a> <a href="#" class="btn btn-default" role="button">Don't pet him</a> </p> </div> </div> </div> <div class="col-xs-6 col-xs-12 col-md-3"> <div class="thumbnail"> <img src="http://i.imgur.com/OcrRV00.jpg" alt="photogenic kitten"> <div class="caption"> <h3>The cutest kitten in the world has no time for bubbles.</h3> <p>What...</p> <p><a href="#" class="btn btn-primary" role="button">Pet him</a> <a href="#" class="btn btn-default" role="button">Don't pet him</a> </p> </div> </div> </div> </div> </div> ，我想）