据说OpenCPU支持链接函数调用以计算例如f(g(x),h(y))
关于参数格式的文档:https://public.opencpu.org/api.html#api-arguments包含一个通过计算
来说明这一点的示例summary(read.csv("mydata.csv"))
在这个例子中,f是通用函数摘要,它将对象作为参数。
我需要计算类似的东西:
mycalc(read.csv("mydata.csv"))
或
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hash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?
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")
sudo R CMD INSTALL mypkg
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)
答案 0 :(得分:1)
从示例中,您似乎传递了名为object
的参数,而您的函数有一个名为df
的参数?对函数执行POST会将http请求的参数映射到函数参数。所以你目前所做的是plotcars(object=dfcars())
,这会导致你看到的错误。尝试:
curl http://localhost/ocpu/library/mypkg/R/plotcars -d 'df=x07a1f83f'