使用关键字导入文件 [英] Import files using key words

问题描述

我想使用部分名称导入图像文件。我有100个.tif图像，其名称由3个不同的元素组成，例如Ai，Bi和Ci，例如：A1 B1 C1.tif，A1 B2 C1.tif，A1 B1 C2.tif， A2 B1 C1.tif...
我在代码的开头定义了Ai，Bi和Ci，并且想要调用包含这3个元素的文件。

I would like to import image files using parts of their names. I have 100 .tif images whose names are composed of 3 different elements, say Ai, Bi and Ci in such way: "A1 B1 C1.tif", "A1 B2 C1.tif", "A1 B1 C2.tif", "A2 B1 C1.tif"... I defined Ai, Bi and Ci at the beginning of the code, and want to call the file that contains these 3 elements.

我尝试过没有机会正确的选项，但找不到更好的选择：

I have tried options that have no chance to be correct, but cannot find anything better:

f = readTiff(Ai Bi Ci)
f = readTiff(Ai, Bi, Ci)
f = readTiff("Ai Bi Ci")

和使用readImage和file.name相同。 getwd给出了正确的路径。
提前谢谢。

and the same using readImage and file.name. The getwd gives the correct path. Thank you in advance.

推荐答案

您可以使用粘贴将字符串粘合在一起的命令。

You can use the paste command to glue strings together.

# for i for A, j for B selection and k for C selection
my.filename <- paste("A", i, " B", j, " C", k, ".tif", sep = "")

所以如果你想导入 A1 B2 C2.tif

i <- 1
j <- 2
k <- 2
my.filename <- paste("A", i, " B", j, " C", k, ".tif", sep = "")

注意paste0默认为sep =所以 paste0（A，i，B，j，C，k，。tt）

Note paste0 defaults to sep = "" so paste0("A", i, " B", j, " C", k, ".tif")

结果my.filename

results in my.filename

 1)  "A1 B2 C2.tif"

如果您正在使用路径：

my.filename <- paste("A", i, " B", j, " C", k, ".tif", sep = "")
my.path <- getwd() # or set this
readTiff(file.path(my.path, my.filename))

如果你想在循环中处理i，j，k的所有组合，那么你可以使用 file.exists 如果是，则导入它。

If you want to work through all combinations of i, j, k in loops then you can use file.exists and if it does then import it.

注意：您使用哪个包 readTiff ？不要忘记确保在您的脚本中加载此包，使用 library（thispackage）如果您收到找不到对象错误。

Note: Which package are you using for readTiff? Do not forget to make sure this package is loaded in your script, with library(thispackage) if you are getting "object not found" errors.

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