How to change the color and the fontsize in the subplots of correlation matrix by corrplot function?

Dear friends,

Please help me how to change the fontsize and color of subplots in the correlation matrix which is plotted by corrplot function?

I need a guidance in hurry!

Thanks advance!

Answer 1

[Voss]

% use the third output (lines and histogram objects) from corrplot:
[~,~,h] = corrplot(randn(4,4))

h = 
  4×4 graphics array:

    Histogram    Line         Line         Line     
    Line         Histogram    Line         Line     
    Line         Line         Histogram    Line     
    Line         Line         Line         Histogram

% get the parent axes of each line/histogram in h:
ax = get(h,'Parent');
% reshape to the same size as h:
ax = reshape([ax{:}],size(h))

ax = 
  4×4 Axes array:

    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes

% set some axes properties:
set(ax(3,1),'Color','g')
set(ax(2,4),'Color','y')
set(ax(4,2),'FontSize',12)

[Khanh Dang]

Thank you very much, Voss,

But how can I set for each item in the subplot, ex. fontsize and color of correlated index? color of scatter of vars, and histogram?

[Khanh Dang]

the same as

[Voss]

% use the third output (lines and histogram objects) from corrplot:
[~,~,h] = corrplot(randn(4,4))

h = 
  4×4 graphics array:

    Histogram    Line         Line         Line     
    Line         Histogram    Line         Line     
    Line         Line         Histogram    Line     
    Line         Line         Line         Histogram

% get the parent axes of each line/histogram in h:
ax = get(h,'Parent');
% reshape to the same size as h:
ax = reshape([ax{:}],size(h))

ax = 
  4×4 Axes array:

    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes
    Axes    Axes    Axes    Axes

% get the histogram, line and text objects in each axes:
ch = reshape(get(ax,'Children'),size(h))

ch = 4×4 cell array
    {1×1 Histogram}    {3×1 Graphics }    {3×1 Graphics }    {3×1 Graphics }
    {3×1 Graphics }    {1×1 Histogram}    {3×1 Graphics }    {3×1 Graphics }
    {3×1 Graphics }    {3×1 Graphics }    {1×1 Histogram}    {3×1 Graphics }
    {3×1 Graphics }    {3×1 Graphics }    {3×1 Graphics }    {1×1 Histogram}

% histogram objects:
hists = [ch{1:size(h,1)+1:end}]

hists = 
  1×4 Histogram array:

    Histogram    Histogram    Histogram    Histogram

% line and text objects:
lt = ch(logical(~eye(size(h,1))));
lt = [lt{:}]

lt = 
  3×12 graphics array:

    Text    Text    Text    Text    Text    Text    Text    Text    Text    Text    Text    Text
    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line
    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line    Line

% now you can set their properties:
set(hists,'FaceColor','c')
set(lt(1,:),'FontSize',14)

val = str2double(get(lt(1,:),'String'));
idx = val <= 0;
set(lt(1,idx),'Color','r')
set(lt(1,~idx),'Color','g')

set(lt(2,idx),'Color','r')
set(lt(2,~idx),'Color','g')

set(lt(3,:),'Color','k','MarkerSize',8)

[Khanh Dang]

Dear Voss,

That is a very wonderful solution, it helped me solve a amount of work in the short time, MATLAB user community is great! Thank you so much, Voss.

[Voss]

You're welcome!