Matlab IF and ELSEIF loop - matlab

Question

function final = fcn(sensor1, sensor2, sensor3)
% resolution = res
res = 10;
% value1 = ((sensor1+sensor2+sensor3)/3);
% | is used for 'or' command
if
sensor1 > res+sensor2 | sensor1> res+sensor3;
value1 = ((sensor2+sensor3)/2);
elseif
sensor2 > res+sensor1 | sensor2> res+sensor3;
value1 = ((sensor1+sensor3)/2);
elseif
sensor3 > res+sensor1 | sensor3> res+sensor2;
value1 = ((sensor1+sensor2)/2);
else
value1 = ((sensor1+sensor2+sensor3)/3);
end
final = value1;
I want it to display the final value based on the average. If any single value is greater than any of the other two by a certain number (resolution in this case) then it should neglect that number and just use the average of the other two. On matlab, my IF and ELSEIF loop has an error saying 'Parse error at , and Parse error at elseif.

Answer 1

You should have you if and your conditions on the same line. And no semi colon after the conditions:
.
.
.
if sensor1 > res+sensor2 || sensor1> res+sensor3
value1 = ((sensor2+sensor3)/2);
elseif sensor2 > res+sensor1 || sensor2> res+sensor3
value1 = ((sensor1+sensor3)/2);
.
.
.
btw you should be using || in this case because you're dealing with scalars.

Answer 2

You can get rid of almost all conditional statements with some vectorized approach. Additionally, it will automatically scale if you have many sensors as inputs with the same conditions.
Code
function value = fcn(sensor1, sensor2, sensor3)
res = 10;
sensor = [sensor1;sensor2;sensor3];
ind_first_cond_met = find(any(bsxfun(#gt,sensor,(res+sensor)'),2),1,'first');
if isempty(ind_first_cond_met)
value = mean(sensor);
else
sum_mat = bsxfun(#plus,sensor,sensor');
mean_every_other_two = [sum_mat(1,2) sum_mat(2,3) sum_mat(3,1)]./2;
value = mean_every_other_two(ind_first_cond_met);
end