Z must be a matrix, not a scalar or vector

Hi guys

I need a 3D graphic for those 3 variables in specific. pitch, roll and Iest have the same size in this case columns of 54 values. I would appreciate if you can help me thank you very much

function[] = Stability (pitch, roll, Iest) 

% pitch, roll and Iest (Data from WorkSpace)

[X,Y]= meshgrid(pitch,roll);

figure
subplot (2,2,1);

surf(X,Y,Iest);

axis([-50 50 -50 50 -0.2 1]);

ylabel ('Roll (°)');

xlabel ('Pitch (°)');

zlabel ('I. Estabilidad');

title ('Stability indexes');
end

% ERROR: "Z must be a matrix, not a scalar or vector"

[madhan ravi]

Can you give the data of lest?

[Walter Roberson]

Is it possible that your pitch, roll, Iest values are scattered -- that pitch(K) is associated with roll(K) and Iest(K), rather than pitch and roll being x and y axes and Iest being a 2D matrix that is length(pitch) by length(roll) ?

[Alex Valero Mora]

yes pitch 54x1

roll 54x1

Iest 54x1

[madhan ravi]

See my answer below

[Alex Valero Mora]

Pitch 0
0
-10
0
10
10
-10
-10
0
0
-10
0
10
10
-10
0
0
-10
0
10
10
0
0
-10
0
10
10
0
0
-10
0
10
10
-10
-10
0
0
-10
0
10
10
-10
0
0
-10
0
10
10
0
0
-10
0
10
10

roll 0
-10
0
10
0
10
-10
10
0
-10
0
10
0
10
10
0
-10
0
10
0
10
0
-10
0
10
0
10
0
-10
0
10
0
10
-10
10
0
-10
0
10
0
10
10
0
-10
0
10
0
10
0
-10
0
10
0
10

Iest 0,989942340654644
0,802178238564791
0,796775799972624
0,803653845064710
0,821687183044870
0,791442057791294
0,777586416644017
0,782758864192040
0,774388293541222
0,552271140648203
0,555229986672985
0,782421186962462
0,760363307512461
0,906406097080077
0,546731674721163
0,583107483466789
0,569868655807287
0,323771406349666
0,575832238546995
0,723197675679337
0,716029101100372
0,748249261674753
0,784435878302803
0,563574908179280
0,553740850165316
0,735360868434881
0,544624923646681
0,419146617486797
0,419146617486797
0,419146617486797
0,419146617486797
0,538115608682760
0,523437658231029
0,419146617486797
0,419146617486797
0,575225929723435
0,576482226716369
0,361019236952593
0,419146617486797
0,554151574670287
0,419146617486797
0,352206741699065
0,773117436982731
0,592747054360200
0,570834362796000
0,594221698267574
0,631551981811119
0,581999337831112
0,585740340470783
0,419146617486797
0,354475826899071
0,575477558982328
0,575818380462714
0,715382090512770

it's all the data, all 54 x 1

Answer 1

[madhan ravi]

If pitch has (1X54) values and roll has the same values as pitch then Iest should have (54X54) values as a matrix.

pitch 

roll

Iest=repmat(Iest,1,54)

function[] = Stability (pitch, roll, Iest) 
% pitch, roll and Iest (Data from WorkSpace)
[X,Y]= meshgrid(pitch,roll);
figure
subplot (2,2,1);
surf(X,Y,Iest);
axis([-50 50 -50 50 -0.2 1]);
ylabel ('Roll (°)');
xlabel ('Pitch (°)');
zlabel ('I. Estabilidad');
title ('Stability indexes');
end

[madhan ravi]

Did you try my answer?

[Alex Valero Mora]

yes but the same error persists: S

[madhan ravi]

But I didn’t have any error

[Alex Valero Mora]

Iest=repmat(Iest,54,1)

I inverted the values and it really worked. Thank you very much: D

[madhan ravi]

your're welcome

[Alex Valero Mora]

the only problem is that he only takes the plane (Iest, Pich) and the other only projects it. as if roll was constant. would you know how to solve this? and thanks.

[madhan ravi]

No I don’t sorry.

[Walter Roberson]

Your data is clearly scattered; the above solution cannot deal with scattered inputs.

[Stephen23]

@Alex Valero Mora: this "answer" does not actually deal with your scattered data. You should accept the answer that actually solves your problem, not just the first answer that comes along.

[Alex Valero Mora]

thanks for the suggestion I am new here and I am adapting to the methodology.

Answer 2

[Walter Roberson]

function[] = Stability (pitch, roll, Iest) 

pv = linspace(-50, 50);
rv = linspace(-50, 50);

Z = griddata(pitch, roll, Iest, pv.', rv);

surf(pv, rv, Z, 'edgecolor', 'none');

axis([-50 50 -50 50 -0.2 1]);

ylabel ('Roll (°)');

xlabel ('Pitch (°)');

zlabel ('I. Estabilidad');

title ('Stability indexes');
end

[Walter Roberson]

Pitch = [
    0
    0
    -10
    0
    10
    10
    -10
    -10
    0
    0
    -10
    0
    10
    10
    -10
    0
    0
    -10
    0
    10
    10
    0
    0
    -10
    0
    10
    10
    0
    0
    -10
    0
    10
    10
    -10
    -10
    0
    0
    -10
    0
    10
    10
    -10
    0
    0
    -10
    0
    10
    10
    0
    0
    -10
    0
    10
    10
    ];

roll = [
    0
    -10
    0
    10
    0
    10
    -10
    10
    0
    -10
    0
    10
    0
    10
    10
    0
    -10
    0
    10
    0
    10
    0
    -10
    0
    10
    0
    10
    0
    -10
    0
    10
    0
    10
    -10
    10
    0
    -10
    0
    10
    0
    10
    10
    0
    -10
    0
    10
    0
    10
    0
    -10
    0
    10
    0
    10
    ];

Iest = [
    0.989942340654644
    0.802178238564791
    0.796775799972624
    0.803653845064710
    0.821687183044870
    0.791442057791294
    0.777586416644017
    0.782758864192040
    0.774388293541222
    0.552271140648203
    0.555229986672985
    0.782421186962462
    0.760363307512461
    0.906406097080077
    0.546731674721163
    0.583107483466789
    0.569868655807287
    0.323771406349666
    0.575832238546995
    0.723197675679337
    0.716029101100372
    0.748249261674753
    0.784435878302803
    0.563574908179280
    0.553740850165316
    0.735360868434881
    0.544624923646681
    0.419146617486797
    0.419146617486797
    0.419146617486797
    0.419146617486797
    0.538115608682760
    0.523437658231029
    0.419146617486797
    0.419146617486797
    0.575225929723435
    0.576482226716369
    0.361019236952593
    0.419146617486797
    0.554151574670287
    0.419146617486797
    0.352206741699065
    0.773117436982731
    0.592747054360200
    0.570834362796000
    0.594221698267574
    0.631551981811119
    0.581999337831112
    0.585740340470783
    0.419146617486797
    0.354475826899071
    0.575477558982328
    0.575818380462714
    0.715382090512770
    ];

Stability(Pitch, roll, Iest)