get_phi_fname_for_lambda.m

% Copyright 2018 
% Open University (Katrine Rogers - k.s.rogers@open.ac.uk)
% University of Southampton (Edward Rogers - etr@orc.soton.ac.uk)

function fname = get_phi_fname_for_lambda(req_lambda)

path = fileparts(mfilename('fullpath'));
seps = strfind(path, filesep);

good_lambdas = [1:64 68:4:128 136:8:256];
[~, ind] = min(abs(good_lambdas-req_lambda*16));
lambda_x_16 = good_lambdas(ind);
lambda = lambda_x_16/16;
fname = [path(1:seps(end)) 'lambda_' num2str(lambda_x_16) 'o16_phis.mat'];

if abs(req_lambda - lambda) > 0.02
    warning('Rounding FOV to %.2f', 1/(lambda))
end