I'm trying to get the m/z values and intensities of an experiment plotted as the x and y coordinates. I use the Cardinal MSI package to load in my data as nothing else can read my data files and average all intensities across a dataset for each m/z value. This works fine, but I then am left with a value that includes the format "m/z = 900.01" for the m/z value and just a number for the intensity.
So far, I've tried just using
data <- gsub("m/z = ", "", data)
which just eliminates the m/z value altogether. I've also tried converting to a dataframe instead of a value, this works fine but the m/z value is then a set of titles for the intensity. Again, trying the gsub removes the m/z value completely. Is there another way to remove the "m/z = " and get just the number that follows it, with that still connected to the intensity value? Thanks!
答案 0 :(得分：0)
似乎您有一个命名向量，其中，名称"m/z = 899.91"的值为0.6186...，名称"m/z = 900.36"的值为{ {1}}等。向量是数字，并且所有值都是不到一的部分。
899.91、900.36等是名称的一部分。因此1.35811...应该让您获得名称的数字部分。
您可能要创建一个数据帧，其中一列用于m / z，一列用于强度：
as.numeric(gsub("m/z = ", "", names(data)))然后您可以my_data = data.frame(
mz = as.numeric(gsub("m/z = ", "", names(data))),
intensity = data
)
，或进行其他更精美的绘图。