help plot of function using handle

b1 =1
b2 =2
b3 =3
%--------Function:
G =@(k) -2*k.^2 + b1 + sqrt( (-4*k.^4 - b2*k.^2 + sqrt((-4*k.^4 - b3*k.^2).^2 + b4^2 ))/2)

%-------Grid:
k = [-2:0.01:2]
% y = bsxfun(f,x,p)
% %-------Plot
% 
% figure
plot(k,G)

help code wont run

Answer 1

[Star Strider]

Call ‘G’ with its argument —

b1 =1

b1 = 1

b2 =2

b2 = 2

b3 =3

b3 = 3

b4 = 4                                      % Replace Missing Value

b4 = 4

%--------Function:
G =@(k) -2*k.^2 + b1 + sqrt( (-4*k.^4 - b2*k.^2 + sqrt((-4*k.^4 - b3*k.^2).^2 + b4^2 ))/2)

G = function_handle with value:
    @(k)-2*k.^2+b1+sqrt((-4*k.^4-b2*k.^2+sqrt((-4*k.^4-b3*k.^2).^2+b4^2))/2)

%-------Grid:
k = [-2:0.01:2]

k = 1×401

-2.0000 -1.9900 -1.9800 -1.9700 -1.9600 -1.9500 -1.9400 -1.9300 -1.9200 -1.9100 -1.9000 -1.8900 -1.8800 -1.8700 -1.8600 -1.8500 -1.8400 -1.8300 -1.8200 -1.8100 -1.8000 -1.7900 -1.7800 -1.7700 -1.7600 -1.7500 -1.7400 -1.7300 -1.7200 -1.7100

% y = bsxfun(f,x,p)
% %-------Plot
% 
% figure
plot(k,G(k))

.

[Tlotlo Oepeng]

youre the best

[Star Strider]

Thank you!

Answer 2

[Benjamin Kraus]

An alternative approach: Use fplot.

b1 = 1;
b2 = 2;
b3 = 3;
b4 = 4;
G =@(k) -2*k.^2 + b1 + sqrt( (-4*k.^4 - b2*k.^2 + sqrt((-4*k.^4 - b3*k.^2).^2 + b4^2 ))/2);
fplot(G)
xlim([-2 2])