“ARSCAM/ARPRAM - ALGORITHM FAILURE”错误的解决

rabin_xu

在用NCL画阴影图，弹出了如下错误：

fatal:ContourPlotPreDraw: ARSCAM/ARPRAM - ALGORITHM FAILURE
fatal:ContourPlotDraw: draw error
warning:WorkstationDeactivate: workstation not active or not opened

后来在NCL的FAQ里查到了解决方法，如下

I'm getting an "ARSCAM/ARPRAM ALGORITHM FAILURE" error message.
This bug was fixed in version 5.2.1 for a large percentage of NCL scripts, but we occasionally see this bug creep up in newer versions of NCL in special cases. If you do run into it with a newer version of NCL, please keep reading for suggestions.

This bug is usually caused by a precision error in our low-level contouring algorithm. It seems to occur when you have very "twisty" contours in a small area, like in a panel plot. It is also more likely happen when you are drawing filled contours using the default "area fill" mode.

One thing you can try as a work-around is to fill the contours using "raster fill" mode instead:
   res@cnFillMode = "RasterFill"

In addition, you can smooth the raster contours, making them closer in appearance to area-filled contours:

  res@cnRasterSmoothingOn = True


Unfortunately, if you need "area fill", there's no instant fix for this. We found that if you tweak certain things, like the rotation of your plot (mpCenterLonF), the size of the plot (vpWidthF/vpHeightF), or the contour levels themselves, you might be able to get rid of this error message.

There's a more detailed and low-level description.

We are interested in hearing from folks who run into this problem and for whom the above suggestions don't help. You can help us debug the problem by sending email to the ncl-talk@ucar.edu list (you must subscribe first) and providing us with the smallest script possible that shows the problem and the data.

尝试着在脚本里增加了这两句，还真就不提示错误了。
res@cnFillMode = "RasterFill"
res@cnRasterSmoothingOn = True

cccc23213

seafairy 发表于 2020-7-29 12:43
加了这两句还是没解决，还有别的招吗？

我遇到了同样的问题，你可试试关闭res4@cnSmoothingOn=false

小宝19950118

这个问题好难解决 反正我是放弃了！附上NCL官网对这个问题的解释
网址：http://www.climate2weather.cn/NCL_ISO/FAQ/index.html#err_msgs_018

I'm getting an "ARSCAM/ARPRAM ALGORITHM FAILURE" error message.
This bug was fixed in version 5.2.1 for a large percentage of NCL scripts, but we occasionally see this bug creep up in newer versions of NCL in special cases. If you do run into it with a newer version of NCL, please keep reading for suggestions.

This bug is usually caused by a precision error in our low-level contouring algorithm. It seems to occur when you have very "twisty" contours in a small area, like in a panel plot. It is also more likely happen when you are drawing filled contours using the default "area fill" mode.

One thing you can try as a work-around is to fill the contours using "raster fill" mode instead:

   res@cnFillMode = "RasterFill"
In addition, you can smooth the raster contours, making them closer in appearance to area-filled contours:
  res@cnRasterSmoothingOn = True
Unfortunately, if you need "area fill", there's no instant fix for this. We found that if you tweak certain things, like the rotation of your plot (mpCenterLonF), the size of the plot (vpWidthF/vpHeightF), or the contour levels themselves, you might be able to get rid of this error message.

There's a more detailed and low-level description.

We are interested in hearing from folks who run into this problem and for whom the above suggestions don't help. You can help us debug the problem by sending email to the ncl-talk@ucar.edu list (you must subscribe first) and providing us with the smallest script possible that shows the problem and the data.

小宝19950118

这个问题好难解决 反正我是放弃了！附上NCL官网对这个问题的解释
网址：http://www.climate2weather.cn/NCL_ISO/FAQ/index.html#err_msgs_018

I'm getting an "ARSCAM/ARPRAM ALGORITHM FAILURE" error message.
This bug was fixed in version 5.2.1 for a large percentage of NCL scripts, but we occasionally see this bug creep up in newer versions of NCL in special cases. If you do run into it with a newer version of NCL, please keep reading for suggestions.

This bug is usually caused by a precision error in our low-level contouring algorithm. It seems to occur when you have very "twisty" contours in a small area, like in a panel plot. It is also more likely happen when you are drawing filled contours using the default "area fill" mode.

One thing you can try as a work-around is to fill the contours using "raster fill" mode instead:

   res@cnFillMode = "RasterFill"
In addition, you can smooth the raster contours, making them closer in appearance to area-filled contours:
  res@cnRasterSmoothingOn = True
Unfortunately, if you need "area fill", there's no instant fix for this. We found that if you tweak certain things, like the rotation of your plot (mpCenterLonF), the size of the plot (vpWidthF/vpHeightF), or the contour levels themselves, you might be able to get rid of this error message.

There's a more detailed and low-level description.

We are interested in hearing from folks who run into this problem and for whom the above suggestions don't help. You can help us debug the problem by sending email to the ncl-talk@ucar.edu list (you must subscribe first) and providing us with the smallest script possible that shows the problem and the data.

Gabriella

感谢！终于出图了

seafairy

加了这两句还是没解决，还有别的招吗？

SAREbenjamin

如果数据精度过高，导致等值线密集、细小、弯弯曲曲等，就可能会出现该报错。
（e.g., 我用ERA5数据计算、绘画水汽输送散度，“疯狂”报错......）

lt5201314

我也遇到了！解决了，谢谢楼主~

KKKKK

我扩大了画图的经度范围，解决了