Question

Infection 1       Infection 2      Infection 3
    6                10                  0
   10                 0                  0
    0                 0                  0
    3                 5                  0
   10                10                  1

我有一个放入R的csv文件，我想创建一个仅指示非零单元格的布尔向量。

Answer 1

我猜你的意思是vector你的意思是你提供的matrix。（为了将来参考，vector只有一个维度。它是list值的一种形式。matrix（或data.frame或data.table）有2个（或更多）尺寸，如X行* Y列）。如果我猜错了，请用您想要的输出格式更新您的问题。

指示哪些数字不为零的简单方法是在矩阵上使用标准比较：

# Recreate your table for this example:
infection_vals <- data.frame(c(6,10,0,3,10), c(10,0,0,5,10), c(0,0,0,0,1));

# You have column names with spaces which can be tricky in R
colnames(infection_vals) <- c("Infection 1", "Infection 2", "Infection 3");

# Output to see it
infection_vals;
>       Infection 1 Infection 2 Infection 3
>1           6          10           0
>2          10           0           0
>3           0           0           0
>4           3           5           0
>5          10          10           1

# It's easier than you think.  Just do a comparison on the table and R will
# iterate through each cell automatically and return a matrix of the same dimensions:
boolean_infection_vals <- (infection_vals > 0 | infection_vals <0);

boolean_infection_vals;
>        Infection 1 Infection 2 Infection 3
>[1,]        TRUE        TRUE       FALSE
>[2,]        TRUE       FALSE       FALSE
>[3,]       FALSE       FALSE       FALSE
>[4,]        TRUE        TRUE       FALSE
>[5,]        TRUE        TRUE        TRUE

# Check the type and class of the result
typeof(boolean_infection_vals);
>[1] "logical"

class(boolean_infection_vals);
>[1] "matrix"

# If we convert the matrix to a data.frame, we can more easily work with the columns
boolean_infection_vals_df <- as.data.frame(boolean_infection_vals);

# You can access each column of the data.frame as a vector with the $ operator.
# Quotes are needed because you have spaces in the column names
boolean_infection_vals_df$"Infection 1";
>[1]  TRUE  TRUE FALSE  TRUE  TRUE

祝你好运！：）

布尔向量指示非零单元格

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