masking data plots for graph

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cvbnm
cvbnm 2017-11-18
评论： cvbnm 2017-11-18
I want my plot to include my mask:
mask=true(size(x));
mask(0>x)=false;
mask=true(size(y));
mask(0>y)=false;
plot(x(mask),y(mask),'.')
It is not a problem, when I only have to mask the x values or y values seperately, only when I have to plot both masks.
Could the problem be that my mask for x and y respectively aren't having a particular definition? I tried with 'xmask' and 'ymask' and add this to the plotting sequence, but it does not work either.

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回答（2 个）

Walter Roberson
Walter Roberson 2017-11-18
xt = x;
xt(xt<0) = nan;
yt = y;
yt(yt<0) = nan;
plot(xt, yt);
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Walter Roberson
Walter Roberson 2017-11-18
mask = (x > 0) & (y > 0);
[b,stats]=robustfit(x(mask),y(mask));
However, this is only going to work if x and y are vectors. If they are 2D then the result of x(mask) and y(mask) is going to be a column vector, because 2D arrays cannot have "holes" in them.
cvbnm
cvbnm 2017-11-18
They are not vectors, so that is maybe why it doesn't work, unfortunately. I added my original code below, just in case my reply to you would be confusing. Does this mean that I can not fit data, with I mask values for both the x- and y-axis?

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cvbnm
cvbnm 2017-11-18
编辑：Walter Roberson 2017-11-18
My original code for fitting was:
[b,stats]=robustfit(x(mask),y(mask));
x1=[min(x(mask)),max(x(mask))];
y1= b(1)+b(2)*x1;
hold on
plot(x(mask),y(mask),'.b');
plot(x1,y1,'-r');
This is used for plotting my data and the fitting. When I use both of the two masks, it can not fit my data. There is no problem when I only masks one of the variables (either x or y).

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