(newbie) spectral derivative

4 次查看（过去 30 天）

Jack Silver 2014-4-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/125263-newbie-spectral-derivative

评论： Jack Silver 2014-4-10

I have data that form a scalar field on a 2D grid, evenly spaced. There is no particular periodicity patern in my data.

I want to calculate the value of the gradient at each grid point with a spectral method in MATLAB. Using simple FFT does not seem to work, especially near the borders (probably because the data are not periodic). I have ears about DCT, but I am not sure.

I would appreciate advice on the best way to do this.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Sean de Wolski 2014-4-10

Why not just use gradient?

Jack Silver 2014-4-10

Thanks, for your answer, but my understanding is that the "gradient" function is based on finite difference, which is not accurate enough for my needs.

I would definitly prefer a spectral solution.

请先登录，再进行评论。

请先登录，再回答此问题。