How to hold different constellations using scatterhistogram?

Question

Louis Tomczyk 2022-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/1770655-how-to-hold-different-constellations-using-scatterhistogram

编辑： Adam Danz 2022-8-1

采纳的回答： Adam Danz

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Dear all,

I hope the title is explicit enough, does anyone have an idea?

Thanks in advance.

Best regards,

louis

Example of code:

% signal vector

X = rand(1,1e3)+1i*rand(1,1e3);

% power in signal

PX= mean(abs(X).^2);

% noise of variance power in signal/10

B = PX/10*(randn(1,1e3)+1i*randn(1,1e3));

% signal + noise

Y = X+B;

% plot

hold all

scatterhistogram(real(X),imag(X))

Error using scatterhistogram
Adding ScatterHistogramChart to axes is not supported. Turn hold off.

scatterhistogram(real(Y),imag(Y))

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Answer 1

Adam Danz 2022-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/1770655-how-to-hold-different-constellations-using-scatterhistogram#answer_1017685

编辑：Adam Danz 2022-7-29

scatterhistogram produces a ScatterHistogramChart object within a figure. When you call hold on, an axes is created if it doesn't already exist, and the axes is prepared to accept new objects. scatterhistogram tells you that you cannot assign the ScatterHistogramChart object to the axes.

Remove hold on so scatterhistogram can create the plot in a figure. Scatterhistogram() is not set up to combine two ScatterHistogramChart objects within the same set of axes.

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Louis Tomczyk 2022-8-1

Dear @Adam Danz,

Yes I misplaced the 'hold on' line.

That's really a pity that we cannot combine more scatterhistograms charts.

Best,

louis

Adam Danz 2022-8-1

编辑：Adam Danz 2022-8-1

在 MATLAB Online 中打开

@Louis Tomczyk, you can, however, group your data together in a table and use a grouping variable to plot multiple sets of data into the same scatterhistogram chart. There are some examples in the documentation: scatterhistogram.

load patients

tbl = table(LastName,Diastolic,Systolic,Smoker)

tbl = 100×4 table

LastName Diastolic Systolic Smoker ____________ _________ ________ ______ {'Smith' } 93 124 true {'Johnson' } 77 109 false {'Williams'} 83 125 false {'Jones' } 75 117 false {'Brown' } 80 122 false {'Davis' } 70 121 false {'Miller' } 88 130 true {'Wilson' } 82 115 false {'Moore' } 78 115 false {'Taylor' } 86 118 false {'Anderson'} 77 114 false {'Thomas' } 68 115 false {'Jackson' } 74 127 false {'White' } 95 130 true {'Harris' } 79 114 false {'Martin' } 92 130 true

s = scatterhistogram(tbl,'Diastolic','Systolic','GroupVariable','Smoker');

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