Can I plot a cfit object and specify the LineSpec using name/value pairs?

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Emily
Emily 2019-8-6
评论： Emily 2019-8-7
I am trying out several fits of data. I want to display the different fits in different colors. There are an indeterminate number of fits, and I want my data to be useful to somebody with limited color vision, so want to use Parula for the colors of the lines. According to the documentation I can plot a cfit object with:
plot(cfit,FitLineSpec,x,y,DataLineSpec)
This works if I use '-k' for the FitLineSpec, but doesn't work if I use 'color','k'.
Minimal example:
X = 1:10;
Y = X.^2;
[fitobject,foErr]=fit(X',Y','poly1');
figure; plot(x,y,'color','c'); % This plots the data in cyan
hold on;
plot(fitobject, 'k-'); % This works fine and makes a black line, but if I want a color not defined by a letter, I need name/value pairs:
plot(fitobject, 'color','k') % This doesn't work, giving the error
Error using cfit/plot>parseinput (line 335)
Must specify both XDATA and YDATA
It also doesn't work to use
plot(fitobject, 'color','k', X,Y,'color','c')
which gives a slightly different parsing error for cfit.
My question is, can I use name/value pairs for specifying the LineSpec when plotting a cfit object, and if so, how?
Thanks,
Emily
p.s. This question submitted itself unexpectedly and now I can't seem to edit the tags. I'm using Matlab R2017b.
  1 个评论
dpb
dpb 2019-8-6
Yeah, for some reason TMW seems to have removed the facility to edit Tags...even I couldn't seem to do so last I tried (but I've not given it another attempt since, either). Don't understand that, either, do I...

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dpb
dpb 2019-8-6
编辑：dpb 2019-8-6
No, TMW didn't implement the named parameter interface in the cfit class plot() method. Another example of not following the general pattern going forward and most irritating, agreed. It's worthy of a "Quality of Implementation" bug report imo.
What you do is save the line handles returned and use those to apply the remaining linestyle/colors/etc. desired for each line. PIT[proverbial]A[ppendage], but what needs must do.
  1 个评论
Emily
Emily 2019-8-7
Thanks dpb,
I appreciate your help! That works for me. For others who might want to do this here's the explicit example:
cmp = colormap(parula(numberFits)) % Gives a numberFits by 3 matrix of RGB values
X = 1:10;
Y = X.^2;
figure; plot(X,Y,'color','c'); % This plots the data in cyan
hold on;
for fitnumber = 1:numberFits
[fitobject,foErr]=fit(X',Y','poly1'); % You would change something about the fit with each cycle of loop)
FitHandle=plot(fitobject);
set(FitHandle,'color',cmp(fitnumber,:));
end

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