MATLAB: Patch – how to choose colors

colorcolorspecpatch

Hey,

I'm having trouble getting a hold on Patch. I have this code:

xFit = logspace(4,8,1000);
yPredict = predint(fitresult,xFit,0.683,'functional','off');
x=[xFit;xFit];
y=[yPredict(:,1)';yPredict(:,2)'];
patch(x,y,1,'FaceColor','r')

I want it to create a filled area that is transparent red, but I can't even get it to be red… it's always black. I went over the documentation and didn't manage to do it myself… any help?

Best Answer

Ok, problem was basically the ; inside the vector definitions, should be:

x=[xFit xFit];
y=[yPredict(:,1)' yPredict(:,2)'];

Although in the end I didn't use them as I switched to the "area" function instead of patch, much better.

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MATLAB: Create a filling between cftool prediction bounds

So I've found the quick way to do it and I'll add it for reference, but it's simplify calling "area" with the x and y data, much easier than patch or other methods:

fitresult = fit( xData, yData, ft, opts );
xFit = logspace(4,8,1000);
yFit = fitresult(xFit);
yPredict = predint(fitresult,xFit,0.683,'functional','off');
% Plot fit with data.
hold on
h = loglog(sample69_nv20_binw,sample69_nv20_bins,'rd',sample69_nv20_binw,sample69_nv20_bins,'r.',xFit,yFit,'r');
area(xFit,yPredict,'EdgeColor','none','FaceColor',[1 0.3 0.3]);
alpha(0.1);

MATLAB: Does code choke at line 22; mesh(xFIT,yFIT,YFIT). Att: x var in Col 1, y var in Col 2 and z var in col 3. Code &error below. We get the scatter; not the mesh. (Save xl file to C:\, upload: Home>Import Data>Import>Import Selection, run code)

>> min(T(:,1))
               -1.17720177
>> max(T(:,1))
               0.544794125

Your x values have a span of about 1.7, but

xfit = min(x):100:max(x);

expects them to have a span of at least 101.

Did you perhaps want

xfit = linspace(min(x), max(x),100);
yfit = linspace(min(y), max(y), 100);

Best Answer

Related Solutions

MATLAB: Create a filling between cftool prediction bounds

MATLAB: Does code choke at line 22; mesh(xFIT,yFIT,YFIT). Att: x var in Col 1, y var in Col 2 and z var in col 3. Code &error below. We get the scatter; not the mesh. (Save xl file to C:\, upload: Home>Import Data>Import>Import Selection, run code)

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