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matlabscientific-notation

Scientific notation in MATLAB

Say I have an array that contains the following elements: 1.0e+14 * 1.3325 1.6485 2.0402 1.0485 1.2027 2.0615 1.7432 1.9709 1.4807 0.9012

Now, is there a way to grab 1.0e+14 * (base and exponent) individually? If I do arr(10), then this will return 9.0120e+13 instead of 0.9012e+14.

Assuming the question is to grab any elements in the array with coefficient less than one. Is there a way to obtain 1.0e+14, so that I could just do arr(i) < 1.0e+14?

Solution

  • I assume you want string output.

    Let a denote the input numeric array. You can do it this way, if you don't mind using evalc (a variant of eval, which is considered bad practice):

    s = evalc('disp(a)');
s = regexp(s, '[\de+-\.]+', 'match');

    This produces a cell array with the desired strings.

    Example:

    >> a = [1.2e-5 3.4e-6]
a =
   1.0e-04 *
    0.1200    0.0340
>> s = evalc('disp(a)');
>> s = regexp(s, '[\de+-\.]+', 'match')
s = 
    '1.0e-04'    '0.1200'    '0.0340'