大约有 2,000 项符合查询结果（耗时：0.0193秒） [XML]
For each row return the column name of the largest value
...make examples using sample reproducible):
DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
A faster solution than using apply might be max.col:
colnames(DF)[max.col(DF,ties.method="first")]
#[1] "V3" "V1" "V2"
...where ties.method...
How can I list all tags in my Git repository by the date they were created?
...ioned by DarVar below)
As an example, in the git/git repo it will list the v2.10.0 tag last:
v2.9.1
v2.9.2
v2.9.3
v2.10.0-rc0
v2.10.0-rc1
v2.10.0-rc2
v2.10.0
The default order would not (git tag):
v2.1.2
v2.1.3
v2.1.4
v2.10.0
v2.10.0-rc0
v2.10.0-rc1
v2.10.0-rc2
v2.2.0
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How to format a floating number to fixed width in Python
...
In Python 3.
GPA = 2.5
print(" %6.1f " % GPA)
6.1f means after the dots 1 digits show if you print 2 digits after the dots you should only %6.2f such that %6.3f 3 digits print after the point.
...
Where is svcutil.exe in Windows 7?
... Why would they remove it? Don't know. Anyway I was able to install the 6.1 version of the SDK, which still contains svcutil.exe (in the bin folder), using Chocolatey, from here: chocolatey.org/packages/windows-sdk-6.1
– David Barrows
Jul 24 '17 at 14:28
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How to combine multiple conditions to subset a data-frame using “OR”?
...
my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]
Some peopl...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...