What is wrong I have been getting errors that it is wrong

function output = impact(x,y)

output = sin(sqrt((x^2)+(y^2)))/sqrt((x^2)+(y^2));

x = -10:1:10;

y = -10:1:10;

z = output;

surfc(x,y,z) %Surface Plot

contour(x,y,z) %Contour lines

colormap(hsv)

Grid off

title('Impact Surface Plot')

xlabel('x-axis')

ylabel('y-axis')

zlabel('z-axis')

end

[KALYAN ACHARJYA]

The MATLAB executes code line by line (sequentially manner), defining the variables before using them in any expression. More follow the given answer.

Answer 1

[Star Strider]

Try something like this:

outputfcn = @(x,y) sin(sqrt((x.^2)+(y.^2)))./sqrt((x.^2)+(y.^2));
x = linspace(-10, 10, 25);
y = linspace(-10, 10, 25);
[X,Y] = ndgrid(x,y);
z = outputfcn(X,Y);

figure
surfc(x,y,z) %Surface Plot
hold on
contour3(x,y,z) %Contour lines
hold off
colormap(hsv)
grid off
title('Impact Surface Plot')
xlabel('x-axis')
ylabel('y-axis')
zlabel('z-axis')

It is necessary to use element-wise opearations in the function, and the ndgrid or meshgrid functions to create the correct matrices, and the hold function to plot the surf and countour3 plots on the same axes. See Array vs. Matrix Operations for more information.

[Star Strider]

It is necessary to create the matrices using ndgrid or meshgrid. Then it will work, draw the plotcs correctly, and return the matrices you want.

I would do something like this:

function [x,y,z] = impact
outputfcn = @(x,y) sin(sqrt((x.^2)+(y.^2)))./sqrt((x.^2)+(y.^2));
x = linspace(-10, 10, 50);
y = linspace(-10, 10, 50);
[X,Y] = ndgrid(x,y);
z = outputfcn(X,Y);

figure
surfc(x,y,z) %Surface Plot
hold on
contour3(x,y,z,'LineWidth',1.5) %Contour lines
hold off
colormap(hsv)
grid off
title('Impact Surface Plot')
xlabel('x-axis')
ylabel('y-axis')
zlabel('z-axis')
end

Then to see the result and recover the matrices:

[Xmtx,Ymtx,Zmtx] = impact;                                      % Call The ‘impact’ Function

I would store them, not display them, since they will be huge matrices and will not easily be understandable just looking at the results.

If you want ‘impact’ to have input arguments, consider carefully what they should be and how to use them. One possibiolity is to provide the number of elements in the ‘x’ and ‘y’ vectors (those would be used as the third arguments to the linspace function calls), their limits, or all of these and possibly others as well.