关于R中“could not find function”的问题

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新手问个初级问题，还请各位不吝赐教。
首先我想模拟一个Y（t）=0.75Y（t-1）+e(t)-0.75e(t-1)的方程，google了一下，给出的列子是：
## armaSim -

# Simulation:

x = armaSim(model = list(ar = c(0.5, -0.5), ma = 0.1), n = 1000)
但是套用时会说could not find function armasim。。。

紧接着，因为我需要fit an ARMA(1,1) to the simulated data,于是继续google，得到例子：
## armaFit -

# Estimate the Parameters:

fit = armaFit(~ arma(2, 1), data = x)

print(fit)
但是套用的时候又被说could not find function armafit。。。（泪牛满面）

然后我试验了上课时本来ok的GARCH的命令，得到了could not find function garch.sim。。。

到这里俺就彻底晕了……
还请各位老师同学指点一二，感谢感谢。

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关键词：function Could find Fin CTI find not function

Hey, every time you want to use a certain function, such as armaSim(), etc., you need to load the package(s) that provides that function. So, you need to add this statement before you run your above codes:
require(fArma);

You can install this package if you have not use it before.... just go to "package"->"install packages"->..... select fArma package, then install.  After you install the package, you can then
require(fArma);
...
you codes here
...

非常感谢！^ ^ok了！

babilun 发表于 2011-3-22 04:47
Hey, every time you want to use a certain function, such as armaSim(), etc., you need to load the package(s) that provides that function. So, you need to add this statement before you run your above codes:
require(fArma);

You can install this package if you have not use it before.... just go to "package"->"install packages"->..... select fArma package, then install.  After you install the package, you can then
require(fArma);
...
you codes here
...

呵呵正解！

感谢babilun，疑惑被解开了。
谢谢。

babilun 发表于 2011-3-22 04:47
Hey, every time you want to use a certain function, such as armaSim(), etc., you need to load the pa ...

could not find function "anyDuplicated"
您知道这个函数在什么包里面吗 谢谢

这里面：
http://stat.ethz.ch/R-manual/R-p ... tml/duplicated.html

babilun 发表于 2011-3-22 04:47
Hey, every time you want to use a certain function, such as armaSim(), etc., you need to load the pa ...

请问提示 could not find function: ma.solve应该怎么办？

babilun 发表于 2011-3-22 04:47
Hey, every time you want to use a certain function, such as armaSim(), etc., you need to load the pa ...

thank you very much ~