Fixed python calculations, added gitignore

Matlab/trap_forces_efficiencies.m

@@ -0,0 +1,23 @@
+close all
+clear
+format compact
+clc
+
+% These calculations are based on Ashkin's article "Forces of a single-beam
+% gradient laser trap on a dielectric sphere in the ray optics regime
+
+load_constants
+
+t = linspace(0, pi/2, 1000);
+t_deg = t * 180/pi;
+psi = pi / 4;
+
+figure
+plot(t_deg, qs_factor(t, psi, n1, n2), ...
+    t_deg, -qg_factor(t, psi, n1, n2), ...
+    t_deg, qmag_factor(t, psi, n1, n2));
+grid
+title(['\psi = ', num2str(psi * 180/pi), '^\circ'])
+xlabel('\theta, ^\circ')
+ylabel('Q')
+legend('Q_s','Q_g','Q_t','location','northwest')