scatter plots with error bars and jitter in MATLAB

error_jitter.m

function error_jitter(xvals, yvals, errvals)
%%ERROR_JITTER(xvals, yvals)
%
% xvals -> array of x positions
% yvals -> cell array of multiple y positions for each x position
% errvals -> cell array of multiple std/sem for each x position
% TODO: allow yvals/errvals to be ragged array
%
% author: William Rowell ([email protected])

hold on
for xidx = 1:length(xvals)
    % spread data over region from x-0.2 to x+0.2
    num_yvals = length(yvals{xidx});
    jitter_delta = 0.4 / num_yvals;
    x = repmat(xvals(xidx),[num_yvals, 1]);
    jitter = ((0:(num_yvals-1))*jitter_delta - 0.2);
    x = x + jitter';
    y = yvals{xidx};
    err = errvals{xidx};
    errorbar(x,y,err,'bo');
end

end