How can I change marker size when plotting?

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Nicholas Pfaff 2018-7-9

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评论： dpb 2018-7-10

I want to change the marker size and line width for my following plot:

function [fitresult, gof] = createFit(diameter, time)
%CREATEFIT(DIAMETER,TIME)
%  Create a fit.
%
%  Data for 'Raw Data' fit:
%      X Input : diameter
%      Y Output: time
%%Fit: 'Raw Data'.
[xData, yData] = prepareCurveData( diameter, time );
% Set up fittype and options.
ft = fittype( 'power1' );
opts = fitoptions( 'Method', 'NonlinearLeastSquares' );
opts.Display = 'Off';
opts.StartPoint = [155.522818446907 -1.88432816467686];
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'Raw Data' );
h = plot( fitresult,'b', xData, yData, '.k', 'MarkerSize',10);                   %Works without 'MarkerSize',10 but not with it
legend( h, 'time vs. diameter', 'Raw Data', 'Location', 'NorthEast' );
% Label axes
xlabel diameter
ylabel time
grid on
hold on;
axis([0 22 0 41]);

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Answer 1

dpb 2018-7-9

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编辑：dpb 2018-7-10

在 MATLAB Online 中打开

h = plot( fitresult,'b', xData, yData, '.k', 'MarkerSize',10);

Looks like you've exceeded the smarts of the enhanced plot command; granted it looks like it might should work but I don't see that the extra named parameters are actually listed in the doc.

I'm guessing you'll need to go at it in two steps; either separate the fit and the data plots initially or

hL=plot(fitresult,'b', xData, yData, '.k');  
hL(1).'MarkerSize'=10;

I'm guessing will work....might be worth a support request unless somebody sees something I missed. Complexity has its paybacks in adding all these objects and so on--the interfaces just get more and more convoluted.

Addendum Test above; does work with the correction that it's hL(1) that's the data line, not hL(2) I had presumed first based on order in the argument list.

Worth a query to TMW on whether the original should work or not; I'm not positive altho I'm guessing they'll say "no"...

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Nicholas Pfaff 2018-7-10

在 MATLAB Online 中打开

Thank you! It worked with

h(1).MarkerSize = 10;

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Answer 2

Image Analyst 2018-7-10

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编辑：Image Analyst 2018-7-10

在 MATLAB Online 中打开

When you call

h = plot( fitresult,'b', xData, yData, '.k', 'MarkerSize',10);

why can't you just pass in a variable instead of 10? And pass in the 'LineWidth' property too.

markerSize = randi([5 25], 1,1); % Whatever you want...
lineWidth = 3; % Whatever...
h = plot(fitresult,'b', xData, yData, 'k.-', ...
    'MarkerSize', markerSize, ...
    'LineWidth', lineWidth);

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Image Analyst 2018-7-10

I guess I never have this problem because I don't plot multiple curves in one call to plot(). I just use multiple calls to plot() where each one plots one curve.

dpb 2018-7-10

Yes, much cleaner syntax that way; this is all a fignewton created by the attempt to overload plot with all these extra features for other objects besides just x, y plots.

They've created a monster by going down this road from which now there probably is no return but also no way to go forward cleanly.

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