format long does not work in a function

i have a function i want to calculate in long format and i added ;

origFormat = get(0, 'format');

format('long');

% -- Work in long format --

set(0,'format', origFormat);

at the first line. but the output is in short fomat.

[Walter Roberson]

Duplicated by later https://www.mathworks.com/matlabcentral/answers/432133-format-long-does-not-work-in-a-function which has a comment.