the correlation matrix to visualize

character, the visualization method of correlation matrix to be used. Allowed values are "square" (default), "circle".

character, "full" (default), "lower" or "upper" display.

ggplot2 function or theme object. Default value is `theme_minimal`. Allowed values are the official ggplot2 themes including theme_gray, theme_bw, theme_minimal, theme_classic, theme_void, .... Theme objects are also allowed (e.g., `theme_classic()`).

character, title of the graph.

logical, if TRUE the legend is displayed.

a character string for the legend title. lower triangular, upper triangular or full matrix.

NULL or logical, whether display the correlation coefficients on the principal diagonal. If NULL, the default is to show diagonal correlation for type = "full" and to remove it when type is one of "upper" or "lower".

a vector of 3 colors for low, mid and high correlation values.

the outline color of square or circle. Default value is "gray".

logical value. If TRUE, correlation matrix will be hc.ordered using hclust function.

the agglomeration method to be used in hclust (see ?hclust).

logical value. If TRUE, add correlation coefficient on the plot.

size and color to be used for the correlation coefficient labels. used when lab = TRUE.

matrix of p-value. If NULL, arguments sig.level, insig, pch, pch.col, pch.cex is invalid.

significant level, if the p-value in p-mat is bigger than sig.level, then the corresponding correlation coefficient is regarded as insignificant.

character, specialized insignificant correlation coefficients, "pch" (default), "blank". If "blank", wipe away the corresponding glyphs; if "pch", add characters (see pch for details) on corresponding glyphs.

add character on the glyphs of insignificant correlation coefficients (only valid when insig is "pch"). Default value is 4.

the color and the cex (size) of pch (only valid when insig is "pch").

the size, the color and the string rotation of text label (variable names).

Decides the number of decimal digits to be displayed (Default: `2`).

A logical passed to melt.array. If TRUE, dimnames will be left as strings instead of being converted using type.convert.

numeric matrix or data frame

other arguments to be passed to the function cor.test.