Why does the programm do not run the script and continues to get unexpected expression?
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x = linspace (0,10);
x = 0:0.5:10;
y = 2-10*x.*exp(-.8*x);
plot (x, y); grid on;
x = 0
y = 2-10*x.*exp(-.8*x)
f = @(x) 2-10*x.*exp(-.8*x)
[xr fx] = fzero(f, 0)
[xrr fx] = fzero(f, 4)
[xmin, fmin]=fminbnd(f,1,2)
%PART 2
line12>>subplot(1,2,2) surf(xgrid,ygrid,func(xgrid,ygrid))
[xgrid, ygrid]=meshgrid(-2:0.1:0,0:0.1:3);
func= @(x,y) 2+x-y+2*x.^2+2*x.*y+y.^2
subplot(1,2,1); contour(xgrid,ygrid,func(xgrid,ygrid))
subplot(1,2,2); surf(xgrid, ygrid, func(xgrid,ygrid))
f = @(x) 2+x(1)-x(2)+2*x(1)^2+2*x(1)*x(2)+x(2)^2
[x, fval]=fminsearch(f,[-.5, 0.5])
采纳的回答
Star Strider
2016-3-29
You cannot run your assignments and commands in any order. You have to write your script so that MATLAB has functions and arguments in its workspace in the order it needs for you to state them.
With a bit of editing of the order of the statements in your code, this works:
x = linspace (0,10);
x = 0:0.5:10;
y = 2-10*x.*exp(-.8*x);
plot (x, y); grid on;
x = 0
y = 2-10*x.*exp(-.8*x)
f = @(x) 2-10*x.*exp(-.8*x)
[xr fx] = fzero(f, 0)
[xrr fx] = fzero(f, 4)
[xmin, fmin]=fminbnd(f,1,2)
%PART 2
% line12>>
func= @(x,y) 2+x-y+2*x.^2+2*x.*y+y.^2;
[xgrid, ygrid]=meshgrid(-2:0.1:0,0:0.1:3);
subplot(1,2,2)
surf(xgrid,ygrid,func(xgrid,ygrid))
subplot(1,2,1)
contour(xgrid,ygrid,func(xgrid,ygrid))
subplot(1,2,2); surf(xgrid, ygrid, func(xgrid,ygrid))
f = @(x) 2+x(1)-x(2)+2*x(1)^2+2*x(1)*x(2)+x(2)^2
[x, fval]=fminsearch(f,[-.5, 0.5])
I leave it to you to determine if it produces the results you want.
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