MATLAB: Mean returning wrong answer

mean

Hi,

I'm trying to calculate mean of a vector and getting a very odd answer. Here's the code:

rg_H25p0 = [29.0, 29.1, 29.5, 30.0, 30.1, 30.2, 30.3, 30.3, …

30.3, 30.3, 30.4, 30.4, 30.4, 30.4, 30.4, 305., 30.6, 30.6, 30.7, …

30.8, 30.9, 30.9, 31.1, 31.1, 31.1, 31.1, 31.1, 31.1, 31.4, 31.4, …

31.4, 31.8];

mean_rg_H25p0 = mean(rg_H25p0)

Matlab keeps returning a mean of 39.1625, which is obviously impossible.

I used mean on a number of vectors and they all came out find, except for this one.

Any ideas?

Best Answer

You have a 305 in second row. I think it is supposed to be 30.5.

Related Solutions

MATLAB: How to repeat calculations and store answers

You should write simple vectorized code, e.g.:

X = [-83.55705;-83.55705;-83.557078;-83.557078;-83.557078;-83.557105;-83.557105;-83.557133;-83.557133;-83.55716;-83.55716;-83.55716;-83.557188;-83.557188;-83.557215;-83.557215;-83.557243;-83.557272;-83.557272;-83.557272;-83.557298;-83.557298;-83.557327;-83.557327;-83.557353;-83.557353;-83.557353;-83.55738;-83.55738;-83.557408;-83.557408;-83.557435;-83.557435;-83.557463;-83.557463;-83.557463;-83.55749;-83.55749;-83.557517;-83.557517;-83.557543;-83.557543;-83.557543;-83.557572;-83.557572;-83.557598;-83.557598;-83.557625;-83.557625;-83.557652;-83.557652;-83.557652;-83.557678;-83.557678;-83.557703;-83.557703;-83.55773;-83.55773;-83.55773;-83.557757;-83.557757;-83.557783;-83.557783;-83.55781;-83.55781;-83.557837;-83.557837;-83.557837;-83.557862;-83.557862;-83.557888;-83.557888;-83.557915;-83.557915;-83.557915;-83.557942;-83.557942;-83.557968;-83.557968;-83.557995;-83.557995;-83.557995;-83.558022;-83.558022;-83.558048;-83.558048;-83.558073;-83.558073;-83.5581;-83.5581;-83.5581;-83.558127;-83.558127;-83.558153;-83.558153;-83.55818;-83.55818;-83.55818;-83.558207;-83.558207;-83.558232;-83.558232;-83.558258;-83.558258;-83.558285;-83.558285;-83.558285;-83.55831;-83.55831;-83.558337;-83.558337;-83.558363;-83.558363;-83.558363;-83.558388;-83.558388;-83.558415;-83.558415;-83.558442;-83.558442;-83.558467;-83.558467;-83.558493;-83.558493;-83.558493;-83.558518;-83.558518;-83.558545;-83.55857;-83.55857;-83.55857;-83.558595];
Y = [40.302548;40.302548;40.302577;40.302577;40.302577;40.302605;40.302605;40.302633;40.302633;40.30266;40.30266;40.30266;40.30269;40.30269;40.302718;40.302718;40.302747;40.302775;40.302775;40.302775;40.302803;40.302803;40.302832;40.302832;40.30286;40.30286;40.30286;40.302888;40.302888;40.302917;40.302917;40.302945;40.302945;40.302973;40.302973;40.302973;40.303002;40.303002;40.30303;40.30303;40.303058;40.303058;40.303058;40.303087;40.303087;40.303115;40.303115;40.303143;40.303143;40.303172;40.303172;40.303172;40.3032;40.3032;40.303228;40.303228;40.303257;40.303257;40.303257;40.303285;40.303285;40.303313;40.303313;40.303342;40.303342;40.303372;40.303372;40.303372;40.303398;40.303398;40.303428;40.303428;40.303457;40.303457;40.303457;40.303485;40.303485;40.303513;40.303513;40.303542;40.303542;40.303542;40.30357;40.30357;40.3036;40.3036;40.303628;40.303628;40.303657;40.303657;40.303657;40.303683;40.303683;40.303713;40.303713;40.30374;40.30374;40.30374;40.303768;40.303768;40.303797;40.303797;40.303825;40.303825;40.303853;40.303853;40.303853;40.303882;40.303882;40.30391;40.30391;40.303938;40.303938;40.303938;40.303967;40.303967;40.303997;40.303997;40.304025;40.304025;40.304055;40.304055;40.304083;40.304083;40.304083;40.304113;40.304113;40.304142;40.30417;40.30417;40.30417;40.304198];
D = sqrt((X(2:end)-X(1:end-1)).^2 + (Y(2:end)-Y(1:end-1)).^2)

MATLAB: Is it possible to detect and replace abnormal/wrong numbers in an array

A = [25.9, 25.9, 26.2, 27, 28, 29, 29.3, 29.6, 3, 30.4, 30.5, 30.4, 30.3, 30.3]
abnorm =mean(A) -  3*std(A); % you can set however many standard deviations to constitute 'abnormal'
n = find(A<abnorm); %locations of abnormals
for i = 1:numel(n)
    if or(n(i) == 1, n(i)==numel(A)) %if first or last index, replace with NaN;
        A(n(i)) = nan;
    else
            A(n(i)) = (A(n(i) - 1) + A(n(i) + 1)) / 2;
    end
end
A(isnan(A)) = []; %remove the endpoints that are NaN

let me know if this works for you

Best Answer

Related Solutions

MATLAB: How to repeat calculations and store answers

MATLAB: Is it possible to detect and replace abnormal/wrong numbers in an array

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