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function fName=NameFrequency(fValue, numDecimalPlaces)
% fName=NameFrequency(fValue, [numDecimalPlaces])
%
% NameFrequency accepts a frequency (in Hz) and returns a
% string naming that frequency in a more readable form. For example:
%
% >> c=Screen('Computer');
% >> c.hw.cpufreq
%
% ans =
%
% 999999997
%
% >> NameFrequency(c.hw.cpufreq)
%
% ans =
%
% 1.00 GHz
%
% >> NameFrequency(c.hw.cpufreq,6)
%
% ans =
%
% 999.999997 MHz
%
% >>
%
%
% By default NameFrequency displays two digits to the right of the decimal
% point. Specify other numbers of digits by passing the optional
% numDecimalPlaces argument.
%
% NameFrequency is used by DescribeComputer to name the clock frequency of
% the CPU. For that purpose, it displays frequency to a specified number of
% decimal places, not to a specified precision. It is therfore a poor
% choice for scientific work, where typcially a fixed precision in digits
% is appropriate.
%
% see also: NameBytes, DescribeComputer
% HISTORY
% 12/17/04 awi Wrote it.
if nargin < 2
numDecimalPlaces=2;
end
fNames={
'Hz',
'KHz',
'MHz',
'GHz',
'THz',
'PHz',
'EHz',
'ZHz',
'YHz'
};
numNames=length(fNames);
foundIndex=0;
for i=1:numNames
if round(fValue/10^((i-1)*3) * (10^numDecimalPlaces)) / (10^numDecimalPlaces) < 1000.00
namesIndex=i;
foundIndex=1;
break;
end
end
if ~foundIndex
error('Failed to find a name for the value');
end
unitsName=fNames{namesIndex};
sprintFormat=['%3.' int2str(numDecimalPlaces) 'f'];
fName=[sprintf(sprintFormat, fValue/10^((namesIndex-1)*3)) ' ' unitsName];
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