我尝试在bash中的for循环中运行后台作业:
for i in $(seq 3); do echo $i ; sleep 2 & ; done
我收到错误:
bash: syntax error near unexpected token `;'
在zsh中命令行有效.
在python distance_transform_edt中,scipy.ndimage.morphology模块中有函数.我将它应用于一个简单的情况,以计算掩盖的numpy数组中单个单元格的距离.
但是,该函数删除数组的掩码,并按预期计算每个单元格的欧几里德距离,其中非空值来自参考单元格,具有空值.
以下是我在博文中给出的一个例子:
%pylab
from scipy.ndimage.morphology import distance_transform_edt
l = 100
x, y = np.indices((l, l))
center1 = (50, 20)
center2 = (28, 24)
center3 = (30, 50)
center4 = (60,48)
radius1, radius2, radius3, radius4 = 15, 12, 19, 12
circle1 = (x - center1[0])**2 + (y - center1[1])**2 < radius1**2
circle2 = (x - center2[0])**2 + (y - center2[1])**2 < radius2**2
circle3 = (x - center3[0])**2 + (y - center3[1])**2 < radius3**2
circle4 …我写了一个小的shell脚本,用xrandr配置连接的外部显示器.
# cat /home/didi/bin/monitor_autoswitcher.sh
#!/bin/bash
xrandr | grep "HDMI1 connected"
if [[ $? == 0 ]]; then
# is connected
xrandr --output HDMI1 --right-of LVDS1 --auto
else
# not connected
xrandr --output HDMI1 --auto
fi
xrandr | grep "VGA1 connected"
if [[ $? == 0 ]]; then
# is connected
xrandr --output VGA1 --right-of LVDS1 --auto
else
# not connected
xrandr --output VGA1 --auto
fi
这样可行.现在我想让它自动触发,并发现这可以用udev完成.我试过了
udevadm monitor
当插入外部显示输出时
KERNEL[465828.240250] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm)
UDEV [465828.243549] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm)
插上电源时
KERNEL[465836.844209] …我在网格上定义了以下 3D 表面：
%pylab inline
def muller_potential(x, y, use_numpy=False):
"""Muller potential
Parameters
----------
x : {float, np.ndarray, or theano symbolic variable}
X coordinate. If you supply an array, x and y need to be the same shape,
and the potential will be calculated at each (x,y pair)
y : {float, np.ndarray, or theano symbolic variable}
Y coordinate. If you supply an array, x and y need to be the same shape,
and the potential will be calculated at each (x,y …是否有scipy.spatial.distance.squareform的反函数？如果没有,编写它来处理巨大距离矩阵的最佳方法是什么？