How to increase decimal places in corrplot function?

I have this code data = [ x y z]; % here original dataswere added

% Calculate the correlation matrix

corrMatrix = corr(data)

% Create a correlation plot

corrplot(corrMatrix,'type', 'Pearson','testR', 'on', 'varNames', {'TO', 'AN', 'TC%', 'TN%', 'C/N', 'F', 'M', 'Temp°C'});

and I got this graph but i want to increase the decimal places of the r2 values in the graph as it is showing the rounded off values. How can i change the code to do so.

Answer 1

[Dyuman Joshi]

I don't have your data, so I am working with the 1st example from the documentation of corrplot.

load Data_Canada

[R,~,H] = corrplot(Data)

R = 5×5

1.0000 0.9266 0.7401 0.7287 0.7136 0.9266 1.0000 0.5908 0.5716 0.5556 0.7401 0.5908 1.0000 0.9758 0.9384 0.7287 0.5716 0.9758 1.0000 0.9861 0.7136 0.5556 0.9384 0.9861 1.0000

H = 
  5×5 graphics array:

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

Here, H is the handle to the plotted graphics objects.

s = size(H);

%Indices of the elements of H to be modified
idx = find(~eye(s));

%Get the parent object of H
ax = get(H,'parent');

%Get the children of parent of H
ch = reshape(get([ax{:}],'Children'),s)

ch = 5×5 cell array
    {1×1 Histogram}    {3×1 Graphics }    {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 }    {3×1 Graphics }    {1×1 Histogram}    {3×1 Graphics }    {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 }    {3×1 Graphics }    {1×1 Histogram}

%Let's check the corresponding graphics
ch{2}

ans = 
  3×1 graphics array:

  Text    (corrCoefs)
  Line    (lsLines)
  Line

ch{2}(1)

ans = 
  Text (corrCoefs) with properties:

                 String: '0.93'
               FontSize: 10
             FontWeight: 'bold'
               FontName: 'Helvetica'
                  Color: [0.1294 0.1294 0.1294]
    HorizontalAlignment: 'left'
               Position: [0.1000 0.9000 0]
                  Units: 'normalized'

  Use GET to show all properties

The 'String' property of the 'Text' objects are the one you want to change.

for k=1:numel(idx)
    %Change the text values to numbers in text form with 4 digits after decimal
    set(ch{idx(k)}(1),'String',sprintf('%0.4f',R(idx(k))));
    
    %Changing the font size
    set(ch{idx(k)}(1),'FontSize',8)
end

[Roja Eliza]

Thanks for the help. I actually changed all the values manually on the figure itself but I ll try this too.

[Dyuman Joshi]

@Roja Eliza Any updates?