Question

运行脚本以保存动画时，我一直收到以下错误：

RuntimeError: SB Error: fourierDraw() requires an FFT that is too large, 6144
If you can handle the large FFT, you may update gsparams.maximum_fft_size.

所以我进入了/Galsim/include/galsim/GSparams.h

我更改了以下内容

来自maximum_fft_size（4096）的

maximum_fft_size（16384）

或2 ^ 12的2 ^ 14。

我仍然得到和以前一样的错误。我应该重新启动机器吗？

Answer 1

这不是更改maximum_fft_size参数的位置。有关如何使用GSParams对象和更新参数的示例，请参见demo7。 GSObject的doc字符串中还有一个示例：

    >>> gal = galsim.Sersic(n=4, half_light_radius=4.3)
    >>> psf = galsim.Moffat(beta=3, fwhm=2.85)
    >>> conv = galsim.Convolve([gal,psf])
    >>> im = galsim.Image(1000,1000, scale=0.05)        # Note the very small pixel scale!
    >>> im = conv.drawImage(image=im)                   # This uses the default GSParams.
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "galsim/base.py", line 1236, in drawImage
        image.added_flux = prof.SBProfile.draw(imview.image, gain, wmult)
    RuntimeError: SB Error: fourierDraw() requires an FFT that is too large, 6144
    If you can handle the large FFT, you may update gsparams.maximum_fft_size.
    >>> big_fft_params = galsim.GSParams(maximum_fft_size=10240)
    >>> conv = galsim.Convolve([gal,psf],gsparams=big_fft_params)
    >>> im = conv.drawImage(image=im)                   # Now it works (but is slow!)
    >>> im.write('high_res_sersic.fits')

运行Galsim时的FFT运行时错误

1 个答案: