Apply a color to a slice of the pie chart

I need to apply white color to a slice of the pie chart. I used the following code but it creates the slice in black color even though I applied white color [1 1 1].

number = [78;79;80;81;82;83;84;85;86;87;88]';
value = [4509;5239;6400;9074;11047;13147;15137;13909;6354;1152;183]';

f = figure;
p = pie(value);

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

delete(f)

pcts = regexp(percentValues, '\d*', 'match');
pcts = cellfun(@(x)str2double(x), pcts);
idx = pcts<7;
combine = number(idx);
pctv = pcts(idx);
percentVals = compose(' (%d%%)',pcts(~idx));
percentVals{end+1} = [' (' num2str(sum(pctv)) '%)'];

nrc = compose('%d ', number(~idx)).';
nrc{end+1} = [num2str(combine) ' '];
cattxt = cellfun(@(x,y)cat(2,x,y),nrc,  percentVals, 'Unif',0);

pText(numel(cattxt)+1:end) = [];

value2 = [value(~idx) sum(value(idx))];

figure
p = pie(value2);
pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch)));
cm1 = [1 1 1]/255;  % white color to a pie slice
cm(end,:) = cm1;

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

for k = 1:numel(cattxt)
    pPatch(k).FaceColor  = cm(k,:);
    pText(k).String = [];
end
legend(cattxt, 'Location','eastoutside','FontSize',12)

Answer 1

[Dyuman Joshi]

"I applied white color [1 1 1]."

Your code doesn't match what you say. You have divided the values by 255, which is doesn't correspond to the white color.

(I have not taken a look at the rest of your code)

number = [78;79;80;81;82;83;84;85;86;87;88]';
value = [4509;5239;6400;9074;11047;13147;15137;13909;6354;1152;183]';

f = figure;
p = pie(value);

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

delete(f)

pcts = regexp(percentValues, '\d*', 'match');
pcts = cellfun(@(x)str2double(x), pcts);
idx = pcts<7;
combine = number(idx);
pctv = pcts(idx);
percentVals = compose(' (%d%%)',pcts(~idx));
percentVals{end+1} = [' (' num2str(sum(pctv)) '%)'];

nrc = compose('%d ', number(~idx)).';
nrc{end+1} = [num2str(combine) ' '];
cattxt = cellfun(@(x,y)cat(2,x,y),nrc,  percentVals, 'Unif',0);

pText(numel(cattxt)+1:end) = [];

value2 = [value(~idx) sum(value(idx))];

figure
p = pie(value2);
pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch)));
%Corrected value
cm1 = [1 1 1];  % white color to a pie slice
cm(end,:) = cm1;

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

for k = 1:numel(cattxt)
    pPatch(k).FaceColor  = cm(k,:);
    pText(k).String = [];
end
legend(cattxt, 'Location','eastoutside','FontSize',12)

[Alberto Acri]

Hi @Dyuman Joshi. Can I ask how to keep the numbers around the pie chart?

Except for the numbers in the white pie.

[Dyuman Joshi]

Here you go -

number = [78;79;80;81;82;83;84;85;86;87;88]';
value = [4509;5239;6400;9074;11047;13147;15137;13909;6354;1152;183]';

f = figure;
p = pie(value);

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

delete(f)

pcts = regexp(percentValues, '\d*', 'match');
pcts = cellfun(@(x)str2double(x), pcts);
idx = pcts<7;
combine = number(idx);
pctv = pcts(idx);
percentVals = compose(' (%d%%)',pcts(~idx));
percentVals{end+1} = [' (' num2str(sum(pctv)) '%)'];

nrc = compose('%d ', number(~idx)).';
nrc{end+1} = [num2str(combine) ' '];
cattxt = cellfun(@(x,y)cat(2,x,y),nrc,  percentVals, 'Unif',0);


pText(numel(cattxt)+1:end) = [];

value2 = [value(~idx) sum(value(idx))];

figure
p = pie(value2);
pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch)));
%Corrected value
cm1 = [1 1 1];  % white color to a pie slice
cm(end,:) = cm1;

pText = findobj(p,'Type','text');

%Converting values to strings for display
%empty string corresponding to white color
str = [string(number(~idx)) ""]

str = 1×8 string array
    "80"    "81"    "82"    "83"    "84"    "85"    "86"    ""

for k=1:numel(pText)
    pText(k).String = str(k);
end

percentValues = get(pText,'String');

for k = 1:numel(cattxt)
    pPatch(k).FaceColor  = cm(k,:);
end

legend(cattxt, 'Location','eastoutside','FontSize',12)

[Alberto Acri]

Thank you for your reply. Can you tell me how to set the size of the numbers placed around the pie chart (the ones you created)?

[Dyuman Joshi]

number = [78;79;80;81;82;83;84;85;86;87;88]';
value = [4509;5239;6400;9074;11047;13147;15137;13909;6354;1152;183]';

f = figure;
p = pie(value);

pText = findobj(p,'Type','text');
percentValues = get(pText,'String');

delete(f)

pcts = regexp(percentValues, '\d*', 'match');
pcts = cellfun(@(x)str2double(x), pcts);
idx = pcts<7;
combine = number(idx);
pctv = pcts(idx);
percentVals = compose(' (%d%%)',pcts(~idx));
percentVals{end+1} = [' (' num2str(sum(pctv)) '%)'];

nrc = compose('%d ', number(~idx)).';
nrc{end+1} = [num2str(combine) ' '];
cattxt = cellfun(@(x,y)cat(2,x,y),nrc,  percentVals, 'Unif',0);


pText(numel(cattxt)+1:end) = [];

value2 = [value(~idx) sum(value(idx))];

figure
p = pie(value2);
pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch)));
cm1 = [1 1 1];
cm(end,:) = cm1;

pText = findobj(p,'Type','text');


str = [string(number(~idx)) ""];
for k=1:numel(pText)
    pText(k).String = str(k);
    
    %%Adjusted font size
    pText(k).FontSize = 12;
end

percentValues = get(pText,'String');

for k = 1:numel(cattxt)
    pPatch(k).FaceColor  = cm(k,:);
end
legend(cattxt, 'Location','eastoutside','FontSize',12)

Answer 2

[MYBLOG]

Your code is almost correct. Do it like this delete /255 :

number = [78;79;80;81;82;83;84;85;86;87;88]';
value = [4509;5239;6400;9074;11047;13147;15137;13909;6354;1152;183]';
f = figure;
p = pie(value);
pText = findobj(p,'Type','text');
percentValues = get(pText,'String');
delete(f)
pcts = regexp(percentValues, '\d*', 'match');
pcts = cellfun(@(x)str2double(x), pcts);
idx = pcts<7;
combine = number(idx);
pctv = pcts(idx);
percentVals = compose(' (%d%%)',pcts(~idx));
percentVals{end+1} = [' (' num2str(sum(pctv)) '%)'];
nrc = compose('%d ', number(~idx)).';
nrc{end+1} = [num2str(combine) ' '];
cattxt = cellfun(@(x,y)cat(2,x,y),nrc,  percentVals, 'Unif',0);
pText(numel(cattxt)+1:end) = [];
value2 = [value(~idx) sum(value(idx))];
figure
p = pie(value2);
pPatch = findobj(p, 'Type','Patch');


cm = colormap(turbo(numel(pPatch)));
cm1 = [1 1 1];  % white color to a pie slice
cm(end,:) = cm1;
pText = findobj(p,'Type','text');
percentValues = get(pText,'String');
for k = 1:numel(cattxt)
    pPatch(k).FaceColor  = cm(k,:);
    pText(k).String = [];
end
legend(cattxt, 'Location','eastoutside','FontSize',12)