Synthax for equation in script

I have to write this equation in matlab script

k and Delta are represented by linspace(r0) and linespace (r1)

It seems that the following does not work. Can someone give support

-sqrt((linspace(-r0, r0, 31).'+ linspace(-r1, r1, 31).'^2).'^2 + 4*(linspace(-r1, r1, 31).'^2)).';

Answer 1

[SCIUSCIA]

Now, it works. Thank you

Answer 2

[Torsten]

r0 = 3;
r1 = 4;
delta = linspace(-r0,r0,31).';
k = linspace(-r1,r1,31).';
0.5*sqrt((delta+k.^2).^2+4*k.^2)

ans = 31x1

7.6322 6.7045 5.8473 5.0603 4.3427 3.6935 3.1113 2.5939 2.1379 1.7385

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