Error using mesh Z must be a matrix, not a scalar or vector. Error in untitled6 (line 5) mesh(W,Y,Z)

Hi, I am trying to commute this 3D plot, however I am receiving an error.

w = 200:50:450;

y=180;

[W,Y] = meshgrid(w,y);

Z= 64.0189+1.4629*W-2.626*Y-0.0012*W.^2+0.0098*W.*Y+0.0082*Y.^2

mesh(W,Y,Z)

Error using mesh

Z must be a matrix, not a scalar or vector.

Error in untitled6 (line 5)

mesh(W,Y,Z)

Answer 1

[KSSV]

As you have given single value of Z, it would be a line.

w = 200:50:450;
y=repmat(180,1,length(w));
[W,Y] = meshgrid(w,y);
Z= 64.0189+1.4629*W-2.626*Y-0.0012*W.^2+0.0098*W.*Y+0.0082*Y.^2

Z = 6×6

1.0e+03 * 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661 0.4544 0.5887 0.7171 0.8394 0.9558 1.0661

mesh(W,Y,Z)

[Tadiwa]

Thank you so much.

[Tadiwa]

Hi, I have implemented the code as advised. How then can I make all the singular lines make one 3D plot showing all the grid lines intersecting.

Below is the code:

w = 200:50:450; w1=200:50:450; w2=200:50:450;w3=200:50:450

y=repmat(180,1,length(w));y1=repmat(200,1,length(w1));y2=repmat(220,1,length(w2));y3=repmat(240,1,length(w2))

[W,Y] = meshgrid(w,y);

Z= ((64.0189+1.4629*W)-2.626*Y-0.0012*W.^2+(0.0098*W.*Y+0.0082*Y.^2));

mesh(W,Y,Z);

hold on

[W1,Y1]=meshgrid(w1,y1);

Z1= ((64.0189+(1.4629*W1))-(2.626*Y1)-(0.0012*W1.^2)+((0.0098*W1.*Y1)+(0.0082*Y1.^2)));

mesh(W1,Y1,Z1)

hold on

[W2,Y2]= meshgrid(w2,y2);

Z2 = ((64.0189+1.4629*W2)-2.626*Y2-0.0012*W2.^2+(0.0098*W2.*Y2)+(0.0082*Y2.^2));

mesh(W2,Y2,Z2)

hold on

[W3,Y3]=meshgrid(w3,y3)

Z3 = ((64.0189+1.4629*W3)-2.626*Y3-0.0012*W3.^2+(0.0098*W3.*Y3)+(0.0082*Y3.^2));

mesh(W3,Y3,Z3)

hold off

xlabel('Weight of bread dough (g)')

ylabel('Baking temperature (°C)')

zlabel('Surface area (cm^2)')

[KSSV]

Why you want to merge single lines into a grid? You need to use all at once. What exactly you are targeting?

[Tadiwa]

I am trying to come up with something like this

[KSSV]

Man for this you need to define, w and y as vectors and then use meshgrid

w = 200:50:450;
y=200:50:500;
[W,Y] = meshgrid(w,y);
Z= 64.0189+1.4629*W-2.626*Y-0.0012*W.^2+0.0098*W.*Y+0.0082*Y.^2

Z = 7×6

1.0e+03 * 0.5034 0.6475 0.7857 0.9178 1.0440 1.1641 0.6546 0.8232 0.9859 1.1425 1.2932 1.4378 0.8468 1.0399 1.2271 1.4082 1.5834 1.7525 1.0800 1.2976 1.5093 1.7149 1.9146 2.1082 1.3542 1.5963 1.8325 2.0626 2.2868 2.5049 1.6694 1.9360 2.1967 2.4513 2.7000 2.9426 2.0256 2.3167 2.6019 2.8810 3.1542 3.4213

surf(W,Y,Z)

[Tadiwa]

All good thanks

Answer 2

[Chunru]

w = 200:50:450;
y=120:30:240;
[W,Y] = meshgrid(w,y);
Z= 64.0189+1.4629*W-2.626*Y-0.0012*W.^2+0.0098*W.*Y+0.0082*Y.^2;
whos

  Name        Size            Bytes  Class     Attributes

  W           5x6               240  double              
  Y           5x6               240  double              
  Z           5x6               240  double              
  cmdout      1x33               66  char                
  w           1x6                48  double              
  y           1x5                40  double              

mesh(W,Y,Z)