MATLAB: Limit significant figures to 2 significant figures

#limit roundingsig figs

et=abs(((stop-new_cos)/stop)*100);

Say I use the above to solve for a number how would I limit the et variable to 2 significant figures?

Best Answer

Using the round function and the option in: Round Elements to Specified Number of Significant Digits is likely to be more consistent.

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MATLAB: Raising to the power of large numbers is giving me the wrong answer

In general, MATLAB uses double-precision, which roughly means that you can expect 16 digits of precision.

If you need higher precision, then there is a very good user-contributed package for doing that, which you can download from the File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/22725-variable-precision-integer-arithmetic.

v1 = vpi(99);
v2 = vpi(95);
v = v1^v2
v =
    38489607889348486119277958028245967896084511560873660346586279535301
481260085342580322673837686274870946109685542866926973747267258531956576
79460590239636893953692985541958490801973870359499

MATLAB: Significant figures in table

Do you need the redirection of the table object? You can create the CSV-file directly:

T = { 'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h'; ...
     3.19 0.25 67.1 66.7 70.3 13.0 45.0 55.2; ...
     3.11 0.92 63.4 65.0 69.5 15.2 27.5 36.0};  % Abbrev. test data
fid = fopen(FileName, 'w');
if fid == -1, error('Cannot open file: %s', FileName); end
nCol = size(T, 2);
fmt = repmat('%s, ', 1, nCol);
fmt(end-1:end) = '\n';
fprintf(fid, fmt, T{1, 1:nCol});
fmt = repmat('%.2f, ', 1, nCol);   % <- Determine the number format here!
fmt(end-1:end) = '\n';
Data = cell2mat(T(2:end, :)).';
fprintf(fid, fmt, Data);
fclose(fid);

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MATLAB: Raising to the power of large numbers is giving me the wrong answer

MATLAB: Significant figures in table

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