I want to draw dual phase portraits in a 4x4 linear differential equation system. My codes contain 4 variables as below (x1, x2, y1, y2).

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kadir can erbas 2021-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/1451619-i-want-to-draw-dual-phase-portraits-in-a-4x4-linear-differential-equation-system-my-codes-contain-4

编辑： kadir can erbas 2021-9-13

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p=0.1; q=15;

x1dom = linspace(-p,p,q);x2dom = linspace(-p,p,q);y1dom = linspace(-p,p,q);y2dom = linspace(-p,p,q);

[X1,X2,Y1,Y2] = ndgrid(x1dom,x2dom,y1dom,y2dom);

A=[1.1 0 0.8 0 ; 0 1.2 0 0 ; 0 0 -0.9 0 ; 0 0 0 -0.5];

X1dot= A(1,1)*X1 + A(1,2)*X2 + A(1,3)*Y1 + A(1,4)*Y2;

X2dot= A(2,1)*X1 + A(2,2)*X2 + A(2,3)*Y1 + A(2,4)*Y2;

Y1dot= A(3,1)*X1 + A(3,2)*X2 + A(3,3)*Y1 + A(3,4)*Y2;

Y2dot= A(4,1)*X1 + A(4,2)*X2 + A(4,3)*Y1 + A(4,4)*Y2;

quiver(X1,X2,X1dot,X2dot)

Error using matlab.graphics.chart.primitive.Quiver/set
Error setting property 'XData' of class 'Quiver':
Value must be an array of numeric type with 3 or fewer dimensions.

Error in quiver (line 81)
set(h,'Parent',parax,'Color_I',c,'LineStyle_I',ls,pvpairs{:});

How could I solve this problem?

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Abolfazl Chaman Motlagh 2021-9-12

your X1 , X2 , X1dot , X2dot are 4 dimensional array. how do you want to plot them with quiver? it is exactly the error the code returns.

"Value must be an array of numeric type with 3 or fewer dimensions."

kadir can erbas 2021-9-13

编辑：kadir can erbas 2021-9-13

I noticed it later. When I write a 2D array in the Quiver function, the problem is fixed.

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