In the r包裹corrplot，您可以混合相关矩阵的下半部分和上半部分的图形类型，以形成良好的视觉效果。我希望在矩阵的下半部分有数字，在矩阵的上半部分有椭圆 - 这都很好。但是，根据我的数据，我看不到一些相关数字，因为它们接近 0。下面是我正在使用的代码和当前输出。
有没有办法改变矩阵下半部分的文本颜色？我想将相关系数的颜色更改为不是白色（它们不需要从红色变为蓝色，黑色就可以了）。
#Saves the correlation matrix for reproducibility
#The matrix was modified based on the answer here: http://stackoverflow.com/a/36893890/5623577
cormatx <- structure(c(1, 0.480473436029381, 0.727971392165508, 0.0755790813842022,
0.647226624978262, 0.706156814758194, 0.73971915882987, 0.073024457099958,
0.480473436029381, 1, 0.540515552878261, 0.106196818240067, 0.505171500429873,
0.480694458288349, 0.538693541543583, 0.158300667842954, 0.727971392165508,
0.540515552878261, 1, 0.111168537597397, 0.587432598932939, 0.673406541830384,
0.724533755640279, 0.139232852746538, 0.0755790813842022, 0.106196818240067,
0.111168537597397, 1, -0.0844917222701804, 0.0382605955575862,
-0.00462812019681349, 0.000406894700952559, 0.647226624978262,
0.505171500429873, 0.587432598932939, -0.0844917222701804, 1,
0.668544141384562, 0.761303240927891, 0.152127182963817, 0.706156814758194,
0.480694458288349, 0.673406541830384, 0.0382605955575862, 0.668544141384562,
1, 0.772678948045676, 0.119611111043454, 0.73971915882987, 0.538693541543583,
0.724533755640279, -0.00462812019681349, 0.761303240927891, 0.772678948045676,
1, 0.174453831824302, 0.073024457099958, 0.158300667842954, 0.139232852746538,
0.000406894700952559, 0.152127182963817, 0.119611111043454, 0.174453831824302,
1), .Dim = c(8L, 8L), .Dimnames = list(c("A. SAT Critical Reading",
"B. SAT Mathematics", "C. SAT Writing Multiple Choice", "D. SAT Essay",
"E. TOEFL Listening Comprehension", "F. TOEFL Structure and Written Expression",
"G. TOEFL Reading Comprehension", "H. TOEFL Test of Written English"
), c("A", "B", "C", "D", "E", "F", "G", "H")))
#Creates the corrplot
corrplot.mixed(cormatx, upper = "ellipse", lower = "number",
tl.pos = "lt", tl.col = "black", tl.offset=1, tl.srt = 0)
他们有一个这样的例子?corrplot（它位于“圆圈+黑色数字”下方）。看来你必须打电话corrplot两次：一次首先绘制椭圆（彩色），然后再次分别绘制系数（指定例如 color=black），因为如果您指定col="black" in corrplot.mixed椭圆也将是黑色的。
另外，如果你看一下corrplot.mixed代码，你可以看到它通过了相同的...对于上部和下部调用，这就是为什么指定例如colour="black" into corrplot.mixed会将省略号和文本都绘制为黑色，而不仅仅是文本。
ie
# draw ellipses + decorations
corrplot(cormatx, type="upper", method="ellipse",
tl.pos="lt", tl.col="black", tl.offset=1, tl.srt=0)
# draw labels in black (disabling all the other stuff already drawn)
corrplot(cormatx, add=T, type="lower", method="number",
col="black", diag=F, tl.pos="n", cl.pos="n")
# if you don't like the lines on the diagonal, (ie diag="n" of corrplot.mixed),
# having a look at corrplot.mixed yields the following code:
n <- nrow(cormatx)
symbols(1:n, n:1, add=TRUE, bg="white", fg="grey", inches=F, squares=rep(1, n))
有点痛。本质上你正在实施corrplot.mixed你自己，唯一的区别是你可以将单独的额外参数传递给上部和下部（其中corrplot.mixed can't).