How do I find the value closest to my desired value in a vector

L=10;
n=1.45;
c=2.9979e8;
dt=6e-12; %time increment
Omega=1.020663297455751e+11;
GAMMAb=3.590391604102621e+08;
T=10*2*L*n/c;     %total time
fmax = 1e9;       %maximun frequency
%fs=80*fmax;

TA=-T/2:dt:T/2;   %time axis for the signal
fs=1/dt;          %sampling frequency
%t = (-T/2/dt:1:T/2/dt)*dt;
Nt=round(T/dt);   
FA = (-Nt/2:Nt/2-1)/Nt*fs  %frequency axis

FA = 1x161224

1.0e+10 * -8.3333 -8.3332 -8.3331 -8.3330 -8.3329 -8.3328 -8.3327 -8.3326 -8.3325 -8.3324 -8.3323 -8.3322 -8.3321 -8.3320 -8.3319 -8.3318 -8.3317 -8.3316 -8.3315 -8.3314 -8.3313 -8.3312 -8.3311 -8.3310 -8.3309 -8.3307 -8.3306 -8.3305 -8.3304 -8.3303

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How do I find a value closest to ftreqlims in frequency axis.

freqlims=Omega/2/pi-GAMMAb/2/pi

frqlims = 1.6187e+10

Answer 1

[Matt J]

interp1(FA,FA, freqlims,'nearest')