How to find F(x) as a function corresponding to SSE

Hello people, I wanted to tune an MPC controller by multi-objective optimization. I got a function named F(x) corresponding to SUM OF SQUARED ERRORS. I wanted to ask you how can I find this F(x) because that x consists of tuning parameters, but there is no x in the SSE.

I wanted to define objectives like:

function z = MyCost(x)
z1 = Obj1(x);
z2 = Obj2(x);
z = [z1;z2];
end
function z = Obj2(x)
x2 = [-2,-2.06844255255530,-2.10111802240337,-2.10207214215159,-2.07526146517879,-2.02451292412454,-1.95348890083216,-1.86566054982205,-1.76428567628777,-1.65239250853804,-1.53276871647954,-1.40795485019919,-1.28024182188043,-1.15167200960094,-1.02404351080532,-0.898917058220401,-0.777625176916384,-0.661283227599589,-0.550801910577864,-0.446900897244986,-0.350123267963795,-0.260850466015488,-0.179317506175302,-0.105628206097490,-0.0397702372619372,0.0183701798020417,0.0689940848575301,0.112376215326565,0.148852171463276,0.178806387106974,0.202660963499328,0.220865404855298,0.233887277897138,0.242203802594575,0.246294368168910,0.246633957017452,0.243687449431385,0.237904773799427,0.229716860287031,0.219532350663439,0.207735012952757,0.194681806681143,0.180701542780160,0.166094081434884,0.151130010952603,0.136050751841587,0.121069031410732,0.106369676412401,0.0921106733889202,0.0784244493380253,0.0654193282764902,0.0531811225443287,0.0417748210490318,0.0312463401434390,0.0216243062184601,0.0129218426573602,0.00513833705450514,-0.00173883199194378,-0.00773262626427703,-0.0128747520831755,-0.0172041491619834,-0.0207655733923148,-0.0236082804897410,-0.0257848151580808,-0.0273499085178893,-0.0283594847237411,-0.0288697761940985,-0.0289365455299935,-0.0286144109254250,-0.0279562710544354,-0.0270128245343276,-0.0258321784481268,-0.0244595399875494,-0.0229369847493287,-0.0213032950761929,-0.0195938622174165,-0.0178406451639657,-0.0160721798275416,-0.0143136320634388,-0.0125868883911908,-0.0109106784727434,-0.00930072380675527,-0.00776990736488226,-0.00632845933697300,-0.00498415452295366,-0.00374251731512679,-0.00260703063098742,-0.00157934554902706,-0.000659488806718442,0.000153934300292741,0.000863543731151624,0.00147299690655855,0.00198681082126404,0.00241019504596732,0.00274889660542891,0.00300905710790205,0.00319708261386290,0.00331952630454898,0.00338298387253520,0.00339400148083940];
xref = 0;
z = sum((xref - x2).^2); 
end
function z = Obj1(x)
x1 = [2,1.63874247131850,1.30113598723865,0.988661074435849,0.702282684517453,0.442501740149494,0.209406582702111,0.00272371795267896,-0.178133542529298,-0.334018122805402,-0.466004651190360,-0.575347586888432,-0.663441885659440,-0.731788066643664,-0.781958253719385,-0.815566925155706,-0.834244359280024,-0.839613210959988,-0.833268126208809,-0.816758276476400,-0.791572673309981,-0.759128111957499,-0.720759575958180,-0.677712916519670,-0.631139620139221,-0.582093472069885,-0.531528922306312,-0.480300962547763,-0.429166326639177,-0.378785833143470,-0.329727696308779,-0.282471640526087,-0.237413663812548,-0.194871306289436,-0.155089291296059,-0.118245418247946,-0.0844565982989858,-0.0537849355427370,-0.0262437680768635,-0.00180359451255733,0.0196021776848615,0.0380717153250028,0.0537295176787565,0.0667214842516229,0.0772103182619426,0.0853712842684588,0.0913883314367051,0.0954505876726022,0.0977492243212971,0.0984746863008280,0.0978142783702301,0.0959500947230647,0.0930572761632816,0.0893025768337506,0.0848432205283080,0.0798260254564022,0.0743867753856379,0.0686498145861152,0.0627278439076208,0.0567218954960092,0.0507214641411961,0.0448047739330606,0.0390391597619528,0.0334815441236355,0.0281789917401103,0.0231693238112417,0.0184817771995578,0.0141376941312045,0.0101512293244300,0.00653006317747807,0.00327611085900524,0.000386218499561911,-0.00214716109894912,-0.00433531950971876,-0.00619267555689865,-0.00773619441822142,-0.00898484589037156,-0.00995910407872319,-0.0106804899069288,-0.0111711571002128,-0.0114535216518036,-0.0115499342062784,-0.0114823942912880,-0.0112723049268382,-0.0109402657837499,-0.0105059027875902,-0.00998773185132617,-0.00940305425603584,-0.00876788109533677,-0.00809688414430708,-0.00740337048650679,-0.00669927826683326,-0.00599519097779952,-0.00530036777418422,-0.00462278741086610,-0.00396920352111308,-0.00334520909327275,-0.00275530814051378,-0.00220299272663229,-0.00169082366174459];
xref = 0;
z = sum((xref - (x1)).^2);
end