How to display workspace results with certain digits

Hi all.

I have a program that calculates temperatures and pressures. My results look like this: T=298.3456 etc and P=2.38947 I have written a program in order to display these results in a graph but I don't want them to show up with so many digits! Anyone knows how to do this? For example, make them show up like T=298 and P=2.40??

Answer 1

[Jan]

Simply round the values to n digits:

round(x * 10^n) / 10^n

There are many other tools for rounding to significant digits e.g. in the FileExchange. Use the methods to search there or in the internet.

[John D'Errico]

round now allows you to round to n digits.

Answer 2

[Thorsten]

 num2str(P, '%.2f')
 num2str(T, '%.0f')

[Fotis]

That's it! Thanks! Do you perhaps also know how to apply this to a multifield structure??

I have for e.g T.w.hp , T.w.lp, T.eg.in etc etc. Your answer applies perfectly to each one of them but is it a way to do it for all T's at once? My program is huge and I have a lot of substructures. Thanks anyway

[Thorsten]

I'm not sure if that's what you are looking for, but you can use the following syntax

   num2str([T.w.hp T.w.lp T.eg.in], '%.2f ')

If you structure T contains only numerical data that you like to be printed in the same format, you can use

num2str(flatten(y), '%.2f ')

with my flatten function

function [y, me] = flatten(x)
%FLATTEN Flatten numeric data (ND matrices or arbitrarily nested cells)
%
%   [Y, ME] = FLATTEN(X)
%
%Sample usage:
%  C = {1; {2,3}; {4,5}; {6,{7,8}}}
%  flatten(C)
%
%  S.pos.x = 10; S.pos.y = 12; S.id = 23; S.pos.q.offset = 0.1;
%  flatten(S)
%
%   [e-mail]  2015-05-21
if iscell(x) 
  y = [];
  for i = 1:numel(x)
    try
      xi = cell2mat(x{i});
    catch me
      xi = flatten(x{i});
    end
    y(end+1:end+numel(xi)) = xi;
  end
elseif isstruct(x)
  y = flatten(struct2cell(x));
else
  y = x(:);
end