据说 OpenCPU 支持链接函数调用来计算,例如f(g(x), h(y))
有关参数格式的文档:https://public.opencpu.org/api.html#api-arguments https://public.opencpu.org/api.html#api-arguments包括一个通过计算来说明这一点的示例
summary(read.csv("mydata.csv"))
在此示例中,f 是通用函数摘要,它采用对象作为参数。
我需要计算如下:
mycalc(read.csv("mydata.csv"))
or
myplot(read.csv("my data.csv"))
其中 f 将数据帧作为参数。当将 read.csv 函数返回的 sessionid 或哈希键作为对象参数给出时,这似乎不起作用。如何解决两个非泛型函数的链接?
这是一个完整的例子:
准备包来测试 f(g(x)) 这里plotcars(dfcars())在R中
dfcars<-function(){
data(cars);
cars
}
plotcars<-function(df){
matplot(1:nrow(df),df)
}
plotcars(dfcars()) # test the two chained functions are working
package.skeleton(list = c("dfcars", "plotcars"), name = "mypkg")
从 ubuntu 终端安装新软件包
sudo R CMD INSTALL mypkg
执行 opencpu 文档中的函数链接命令
curl http://localhost/ocpu/library/mypkg/R/dfcars -d ""
/ocpu/tmp/x07a1f83f/R/.val
/ocpu/tmp/x07a1f83f/stdout
/ocpu/tmp/x07a1f83f/source
/ocpu/tmp/x07a1f83f/console
/ocpu/tmp/x07a1f83f/info
'#replace session id with returned one above
curl http://localhost/ocpu/tmp/x07a1f83f/R/.val/print
speed dist
1 4 2
2 4 10
3 7 4
'# POST chaining with the generic function summary works
curl http://localhost/ocpu/library/base/R/summary -d 'object=x07a1f83f'
/ocpu/tmp/x0e29fd5c/R/.val
/ocpu/tmp/x0e29fd5c/stdout
/ocpu/tmp/x0e29fd5c/source
/ocpu/tmp/x0e29fd5c/console
/ocpu/tmp/x0e29fd5c/info
# and the summary gets printed
curl http://localhost/ocpu/tmp/x0e29fd5c/R/.val/print
speed dist
Min. : 4.0 Min. : 2.00
1st Qu.:12.0 1st Qu.: 26.00
Median :15.0 Median : 36.00
Mean :15.4 Mean : 42.98
3rd Qu.:19.0 3rd Qu.: 56.00
Max. :25.0 Max. :120.00
# POST chaining with the nongeneric function plotcars doesn't work
curl http://localhost/ocpu/library/mypkg/R/plotcars -d 'object=x07a1f83f'
unused argument (object = object)
In call:
plotcars(object = object)