MATLAB: How to remove the line in 3D plot

3d plots mesh plot surface plotMATLAB

I am very new to MatLab, I am trying to do 3D plotting as a surface but I think I am doing something wrong since my image does not look right. Also when I try to do a Mesh or surf it complains that "z must be a matrix, not a scalar or vector." To resolve this I let Z=meshgrid(z); in order to change z to a Vector. I am not sure if this is right.
Thank you in advance.
Below is my code:
slow = [21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24];
fast = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20];
z = [130987 72144 63869 60094 61169 52175 50125 43487 47181 38644 21694 34581 42581 38725 37137 28512 30225 56275 57875 64706 132044 74850 69681 66281 63337 56937 51250 45706 40056 29337 18175 28444 37894 41156 31331 29444 33150 45438 44225 33444 132994 75606 71137 69362 57494 50775 46606 42562 30319 27894 26875 33337 39144 35725 29087 29619 42656 45481 38550 34581 133925 78169 65931 75050 60944 59769 49944 38762 35025 36681 32944 37550 44319 41294 41237 34506 47269 51850 42394 39487];
figure
plot3(slow,fast,z)
xlabel('slow')
ylabel('fast')
grid on
% This is what I use to plot Mesh graph but it does not look right I am not sure if using Z=meshgrid(z); is correct?
% [X1, X2] = meshgrid(slow,fast);
%
% Z=meshgrid(z);
% %Z=X1.*X2;
%
% figure
% mesh(X1,X2,Z)
% shading interp

Best Answer

clc; clear all ;
slow = [21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24];
fast = [1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20];
z = [130987	72144	63869	60094	61169	52175	50125	43487	47181	38644	21694	34581	42581	38725	37137	28512	30225	56275	57875	64706	132044	74850	69681	66281	63337	56937	51250	45706	40056	29337	18175	28444	37894	41156	31331	29444	33150	45438	44225	33444	132994	75606	71137	69362	57494	50775	46606	42562	30319	27894	26875	33337	39144	35725	29087	29619	42656	45481	38550	34581	133925	78169	65931	75050	60944	59769	49944	38762	35025	36681	32944	37550	44319	41294	41237	34506	47269	51850	42394	39487];
x = unique(slow) ; 
y = unique(fast) ; 
nx = length(x) ; 
ny = length(y) ; 
X = reshape(slow,ny,nx) ; 
Y = reshape(fast,ny,nx) ; 
Z = reshape(z,ny,nx) ; 
surf(X,Y,Z)
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