MATLAB: Trimming numbers

trimming

how can I trim numbers in matlab (similar to the left and right functions in excel). For example, if: A=[3829 3620 3714] and i want to get the first two digits: to get B=[38 36 37], how can i do so?

Best Answer

A = [3829 36203 371];

% Robust to different 'lengths'

fix(A ./ 10.^(ceil(log10(abs(A)))-2))

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MATLAB: How to format numbers in exponential notation with base 1e3

This will correctly calculate tha mantissas:

rfxm = @(x,xpnt) [sign(x).*10.^(log10(abs(x))-xpnt)];                   % Anonymous Function Creating Reformatted Number

so:

a = [25.12; 67.29; 120.00; 256.65; 501.58; 1366.26];
xpnt = +3; 
Out = rfxm(a,xpnt)

produces:

This is as close as I can get to your desired output:

    Out = [sprintf('1e%d * [',xpnt) sprintf('%.4f\t',  rfxm(a.',xpnt)) ']']

MATLAB: Trimming arrays within cell

The shown code is fast and clear. A reader can recognize, what it should do directly. I hestitate to think, that a corresponding cellfun command would be faster or nicer. So you do not get an advantage for debugging or the runtime. Even if the runtime is a little bit faster, the effort for programming and debugging will exceed this time.

So I'd perfer the "solution" not to care about the "ugliness" of such a useful piece of code. I've seen many code, which are much more ugly.

Best Answer

Related Solutions

MATLAB: How to format numbers in exponential notation with base 1e3

MATLAB: Trimming arrays within cell

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