Finding the mean along X axis on plot?

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bio lim
bio lim 2015-7-3
评论： Walter Roberson 2015-7-3
Hello. I am trying to find the mean along the X axis as follows.
As shown in the plot, I would like to find the mean of the 'GS-TAS' scatter plots on different altitudes. For example, by drawing a line perpendicular to the Altitude axis on 2.35x10^4 feet, you can see corresponding GS-TAS values. I would like to find the mean of those values, on all altitude levels then plot it against the altitude. Is it possible? Any simple methods to do it? Thanks.

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Walter Roberson
Walter Roberson 2015-7-3
level_spacing = 500;
Alt = .... %vector of the altitudes of each data point
GSTAS = ... %vector of the GS-TAS for each data point
altbins = 1 + floor(Alt(:) ./ level_spacing); %convert altitude to relative level number
mean_gstas = accumarray(altbins, GSTAS(:), [], @mean, NaN); %all the real work
altlevels = level_spacing * (0:length(mean_gstas)-1);
plot(altlevels, mean_gstas, '*-');
With this code, any altitude level for which there is no data will not show a connecting line; no interpolation is implied. If you want connecting lines then change the plot() to
hasdata = ~isnan(mean_gstas);
plot(altlevels(hasdata), mean_gstas(hasdata), '*-');
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Hugo
Hugo 2015-7-3
编辑：Hugo 2015-7-3
Hi coffee You can get the vectors that the answer of Walter require as follows. For example, in the case of the altitude, do this:
Alt = cell2mat(arrayfun(@(x)data2(x).altitude',1:numel(data2),'UniformOutput',false));
This certainly looks overly complicated for a reason: The data in your fields are column vectors. Should they be row vectors, you could have obtained the same by doing this:
Alt = [data2.altitude];
Hope this helps. Hugo
Walter Roberson
Walter Roberson 2015-7-3
Alt = vertcat(data2.altitude);
should do fine with column vectors.

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