Why wont matlab plot my equations?

Question

Lynsey King 2021-2-3

回答： Walter Roberson 2021-2-3

loglog(x,y1,'r',x,y2,'b')
x=logspace(-1,6);
y1=((24./R_e)+(1./1+sqrt(R_e))+0.4);
y2=(24./R_e).*(1+0.27*R_e).^0.43+0.47.*1-exp(-0.04*R_e.^0.38);

Answer 1

Walter Roberson 2021-2-3

Your equation is independent of x.

R_e = linspace(-5,5).';

y1 = ((24./R_e)+(1./1+sqrt(R_e))+0.4);

y2 = (24./R_e).*(1+0.27*R_e).^0.43+0.47.*1-exp(-0.04*R_e.^0.38);

subplot(2,1,1); plot(R_e, real(y1), 'b', R_e, imag(y1), 'r'); title('y1'); xlabel('R_e'); ylim([-10 10])

subplot(2,1,2); plot(R_e, real(y2), 'b', R_e, imag(y2), 'r'); title('y2'); xlabel('R_e'); ylim([-10 10])