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Logical operator in a handlebars.js {{#if}} conditional
...le who developed Handlebars.
Handlebars.registerHelper('ifCond', function(v1, v2, options) {
if(v1 === v2) {
return options.fn(this);
}
return options.inverse(this);
});
You can then call the helper in the template like this
{{#ifCond v1 v2}}
{{v1}} is equal to {{v2}}
{{else}}
...
How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data?
...ld_cluster.sh command. I had first manually deleted the /usr/local/postgres9.3 directories, than ran this command and it seems I lost the entire /usr/local/var/postgres directory (I was able to restore it from Time Machine)
– peter_v
Feb 9 '15 at 17:16
...
房多多：懂用户比懂互联网重要 - 资讯 - 清泛网 - 专注C/C++及内核技术
...，面对的客户也多，成交量越大；小中介网点少，甚至是纯粹的游击战，根本就没有什么网点，属于抓几个客户就是几个客户。大中介属于撒网捕鱼，小中介属于鱼竿钓鱼。
再接着说买主
对于买主而言，房子这东西，人人都...
For each row return the column name of the largest value
...t.seed() to 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...
Cosine Similarity between 2 Number Lists
...time the nuts-and-bolts implementation:
import math
def cosine_similarity(v1,v2):
"compute cosine similarity of v1 to v2: (v1 dot v2)/{||v1||*||v2||)"
sumxx, sumxy, sumyy = 0, 0, 0
for i in range(len(v1)):
x = v1[i]; y = v2[i]
sumxx += x*x
sumyy += y*y
su...
成功熬了四年还没死？一个IT屌丝创业者的深刻反思 - 资讯 - 清泛网 - 专注C...
...开发的App的时候，我就忍不住仰望星空。
这些原始而纯粹的行业，正在等待IT精英们的降级。如同蒲公英一般的伞兵，在黑夜里从天而降，长驱直入，用最智慧的产品、最优质的服务拯救这些早就该死的行业。
屌丝的生命...
Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with
... 2>/dev/null
and after that change the configuration file:
Postgresql 9.3
Postgresql 9.4
The next step is: Restarting your db instance:
service postgresql-9.3 restart
If you have any problems, you need to set password again:
ALTER USER db_user with password 'db_password';
...
Finding quaternion representing the rotation from one vector to another
...
Quaternion q;
vector a = crossproduct(v1, v2);
q.xyz = a;
q.w = sqrt((v1.Length ^ 2) * (v2.Length ^ 2)) + dotproduct(v1, v2);
Don't forget to normalize q.
Richard is right about there not being a unique rotation, but the above should give the "shortest arc," w...
Javascript Array.sort implementation?
...edian of first, last and middle element.
var v0 = a[from];
var v1 = a[to - 1];
var v2 = a[third_index];
var c01 = comparefn(v0, v1);
if (c01 > 0) {
// v1 < v0, so swap them.
var tmp = v0;
v0 = v1;
v1 = tmp;
} // v0 <= v1.
...
How to get the name of enumeration value in Swift?
...s, it's the Swift compiler and the Swift Runtime Libaries. I can use Xcode 9.3 but my Code can still be Swift 3 and then I wont' be able to use Swift 4 features. Using Xcode 9.3, this code doesn't work despite Xcode 9.3 being much newer than Xcode 7.
– Mecki
Ma...