i have two matrix and want to plot an surf so how to keep my z axies along with my two matrix.

i have two matrix of 61 co-ordinates

i want to give an z-axies which have my both x & y and have to spread along z axies.

[Mil Shastri]

Hello,

Could you please share sample code to create the matrices and also a sample of what you want the ouput matrix to look like.

[Walter Roberson]

I suspect that you want griddedInterpolant()

[D KUSHAL KUMAR]

x = [1
1;0.98729;0.97198;0.95128;0.92554;0.8951;0.86035;0.82183;0.78007;0.73567;0.68922;0.64136;0.59272;0.54394;0.49549;0.44767;0.40077;0.35505;0.31078;0.26813;0.22742;0.18906;0.15345;0.12094;0.09185;0.06643;0.04493;0.02748;0.01423;0.00519;0.00044;0.00091;0.00717;0.0189;0.03596;0.05827;0.08569;0.118;0.1549;0.19599;0.99674;1;]
y = [0;0.00043;0.0018;
0.00423;
0.00763;
0.01184;
0.01679;
0.02242;
0.02866;
0.0354;
0.04249;
0.04975;
0.05696;
0.0639;
0.0702;
0.07546;
0.07936;
0.08173;
0.08247;
0.08156;
0.07908;
0.07529;
0.07037;
0.06448;
0.05775;
0.05033;
0.04238;
0.03408;
0.02562;
0.01726;
0.00931;
0.00234;
-0.00286;
-0.00682;
-0.01017;
-0.01265;
-0.01425;
-0.015;
-0.01502;
-0.01441;
-0.01329;
-0.01177;
-0.00998;
-0.00804;
-0.00605;
-0.0041;
-0.00228;
-0.00065;
0.00074;
0.00186;
0.00268;
0.0032;
0.00342;
0.00337;
0.00307;
0.00258;
0.00196;
0.00132;
0.00071;
0.00021;
0;
]
z = [1;2;3;4;5;6;7;8;9;10]
surf(x,y,z)  

here is the code and thoe output error is z is an scalar

[Walter Roberson]

Your x is length 43. Your y is length 61. Your z is length 10. It is not obvious what you want the result to be. Are you looking for a cuboid grid to be drawn?

[D KUSHAL KUMAR]

yep all i need a cuboid grid. my X and Y are 61 ( sorry for the false upload i have no idea how did that turn into 40) but what should i keep in Z to get an cuboid grid.

x and Y are my co-ordinates which are defined from my sensor

[Walter Roberson]

Does it just have to look like a wireframe cuboid grid, or do you need each cuboid to be individually constructed with proper vertex order such as for CAD purposes or lighting purposes?

Your x and y vertices do not appear to be in sorted order: is it okay to sort them and create the implied cuboid, or is there significance to the order implying something about connectivity ?

[D KUSHAL KUMAR]

nope just the cuboid grid is enough. Just the plot should be in 3 planes that is enough.

Answer 1

[Sammit Jain]

Hi Kushal,

It seems that the data you shared may not be in accordance with the requirement you have. However, working on the assumption that all the vectors, X, Y and Z are of the same length, then I believe you're looking for plot3. See the documentation here: https://www.mathworks.com/help/matlab/ref/plot3.html

Assuming here that all 3 coordinates are available and it is indeed a 3d plot. If that is a desired scenario, then simply plot3(X,Y,Z) should resolve the query.

Not sure what is intended by "spread along z axis", could you perhaps give an example? From the comments, it seems that the desired output is a 3d plot, even though only two coordinates are available.

A possible solution in that scenario will be to simply put 0 in all the Z axis values to see a 3d plot.

For example, if X = [2 3 4], Y = [10, 20, 30]. Assign Z = [0 0 0]. Then plot3(X,Y,Z) should work.

[Walter Roberson]

I would instead say scatter3 with grid on