Can someone help me with my programs logic?

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Joseph
Joseph 2014-5-12
回答： Walter Roberson 2014-5-12
I wrote this program which shows a graph in 4 subplots, each with a different view. then the program finds the min and max of the grid. I'm trying to create a flow chart of the programs logic. Does anyone know the order that the program functions? Or is it as simple as whatever is typed first is executed first? Thank You
% define x ,y and z
x = -10:1:10;
y = x;
[xGrid,yGrid] = meshgrid(x,y); % creates matrices to represent x and y
z = (1./((xGrid+3).^2 + (yGrid-1).^2 + 2)) + ((xGrid-yGrid) ./ ((xGrid-1) .^2 + (yGrid-2) .^2 + 4));
subplot(2,2,1)
surf(x,y,z)
title('Isometric View') % default view is isometric
xlabel('X')
ylabel('Y')
zlabel('Z')
subplot(2,2,2)
surf(x,y,z)
az=0; % changing elevation and azimuth can change veiwing angle
el=90;
view(az,el) % tell Matlab how to view it
title('View Normal to X-Y Plane')
xlabel('X')
ylabel('Y')
zlabel('Z')
subplot(2,2,3)
surf(x,y,z)
view(0,0)
title('View Normal to X-Z Plane')
xlabel('X')
ylabel('Y')
zlabel('Z')
subplot(2,2,4)
surf(x,y,z)
az=90;
el=0;
view(az,el)
title('View Normal to Y-Z Plane')
xlabel('X')
ylabel('Y')
zlabel('Z')
% Min/NegFunction represents the notation for an anonymous function. it
% creates a function where x is vector of independant variables.
MinFunction = @(x)(1./((x(1)+3).^2 + (x(2)-1).^2 + 2)) + ((x(1)-x(2)) ./ ((x(1)-1) .^2 + (x(2)-2) .^2 + 4));
NegFunction = @(x)(-1./((x(1)+3).^2 + (x(2)-1).^2 + 2)) + ((x(1)-x(2)) ./ ((x(1)-1) .^2 + (x(2)-2) .^2 + 4));
[xyMaxVector,zMax] = fminsearch(NegFunction,[0,3]);
xMax = xyMaxVector(1);% values of x when z is max
yMax = xyMaxVector(2);% value of min when z is max
[xyMinVector,zMin] = fminsearch(MinFunction,[0,1]);
xMin = xyMinVector(1);% values of x and y when z is min
yMin = xyMinVector(2);
fprintf('The Min Value was: z(%6.3f,%6.3f) = %6.3f\n',xMin,yMin,zMin)
fprintf('The Max Value was: z(%6.3f,%6.3f) = %6.3f\n',xMax,yMax,-zMax)

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回答（1 个）

Walter Roberson
Walter Roberson 2014-5-12
When there are no "if" or "for" or "while" or "break" or "continue" or "return" or "quit" or "exit", then statements are executed in sequence they appear in.

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