increase the precision of pie chart labels

Hi!

I am trying to create a pie chart and increase the precision of the percentage to two decimals but it gives an error even for the simplist example as below.

X = [1/3 2/3];

pie(X,'%.3f%%')

Error using pie (line 71)

X and EXPLODE must be the same length.

line 71 [[sliceCounts, explode, labels, displayNames] = parseArgs(args, nargs);]

Thank you for teaching me the right one!

[Ameer Hamza]

This example run fine on my system. Can you tell the name of MATLAB release? Also try this

X = [1/3 2/3];
pie(X, "%.3f%%")

Also paste the output of

which pie

[sa ab]

Hi Ameer!

Thank you for support.

You are right it should be very simple but I do not know why it does not work.

Here is the result of which pie:

/Applications/MATLAB_R2019b.app/toolbox/matlab/specgraph/pie.m

It is R2019b.

This is what you suggested:

>> pie(x)

>> X = [1/3 2/3];

pie(X, "%.3f%%")

Error using pie (line 71)

Cell array of character vectors must be the same length as X.

Thank you!

[Ameer Hamza]

I am using R2020a, so I cannot try it on R2019b. But from the output of 'which pie' and the error message, I couldn't figure out the issue. The definition of the pie function seems correct.

Answer 1

[Vinai Datta Thatiparthi]

Hello,

MATLAB R2020a has this new feature that allows the user to specify a numeric format for the percentage labels on a pie chart. For example, you can specify the number of decimal places or significant digits to display in the label. Older versions (R19b and earlier) do not support this feature, and you will be prompted with a length-mismatch error.

Please update MATLAB to the latest version i.e. R2020a to be able to use the function "pie" in the way that you mentioned.

Additionally, these links can be useful to you -

• Documentation of pie: Latest changes to "labels" input argument that allows you to specify its numeric format
• Release Notes: All the latest updates/features to MATLAB

Hope this helps!