MATLAB: How to optimize the Matlab code

filterFilter Design Toolbox

Hi , i have written this Matlab code but i realize that's a little long so i want to optimize it but i don't know how . Can anyone help me please?
 clc;
 clear all;
 close all;
 load('C:\Users\del.dell-PC\pfe\base de donnée\patient sans 
 crise\chb01_01_edfm.mat')
 deriv1=(val(1,:)-0)/2.559375;
 Fs=256;
 t1=(0:length(deriv1)-1)/Fs; 
 deriv2=(val(2,:)-0)/2.559375;
 Fs=256;
 t2=(0:length(deriv2)-1)/Fs;
 deriv3=(val(3,:)-0)/2.559375;
 Fs=256;
 t3=(0:length(deriv3)-1)/Fs;
 deriv4=(val(4,:)-0)/2.559375;
 Fs=256;
 t4=(0:length(deriv4)-1)/Fs;
 deriv5=(val(5,:)-0)/2.559375;
 Fs=256;
 t5=(0:length(deriv5)-1)/Fs;
 deriv6=(val(6,:)-0)/2.559375;
 Fs=256;
 t6=(0:length(deriv6)-1)/Fs;
 deriv7=(val(7,:)-0)/2.559375;
 Fs=256;
 t7=(0:length(deriv7)-1)/Fs;
 deriv8=(val(8,:)-0)/2.559375;
 Fs=256;
 t8=(0:length(deriv8)-1)/Fs;
 deriv9=(val(9,:)-0)/2.559375;
 Fs=256;
 t9=(0:length(deriv9)-1)/Fs;
 deriv10=(val(10,:)-0)/2.559375;
 Fs=256;
 t10=(0:length(deriv10)-1)/Fs;
 deriv11=(val(11,:)-0)/2.559375;
 Fs=256;
 t11=(0:length(deriv11)-1)/Fs;
 deriv12=(val(12,:)-0)/2.559375;
 Fs=256;
 t12=(0:length(deriv12)-1)/Fs;
 deriv13=(val(13,:)-0)/2.559375;
 Fs=256;
 t13=(0:length(deriv13)-1)/Fs;
 deriv14=(val(14,:)-0)/2.559375;
 Fs=256;
 t14=(0:length(deriv14)-1)/Fs;
 deriv15=(val(15,:)-0)/2.559375;
 Fs=256;
 t15=(0:length(deriv15)-1)/Fs;
 deriv16=(val(16,:)-0)/2.559375;
 Fs=256;
 t16=(0:length(deriv16)-1)/Fs;
deriv17=(val(17,:)-0)/2.559375;
Fs=256;
t17=(0:length(deriv17)-1)/Fs;
deriv18=(val(18,:)-0)/2.559375;
Fs=256;
 t18=(0:length(deriv18)-1)/Fs;
 deriv19=(val(19,:)-0)/2.559375;
 Fs=256;
 t19=(0:length(deriv19)-1)/Fs;
 deriv20=(val(20,:)-0)/2.559375;
 Fs=256;
 t20=(0:length(deriv20)-1)/Fs;
 deriv21=(val(21,:)-0)/2.559375;
 Fs=256;
 t21=(0:length(deriv21)-1)/Fs;
 deriv22=(val(22,:)-0)/2.559375;
 Fs=256;
 t22=(0:length(deriv22)-1)/Fs;
 deriv23=(val(23,:)-0)/2.559375;
 Fs=256;
 t23=(0:length(deriv23)-1)/Fs;
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 a = filtfilt(d1,deriv1);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 b = filtfilt(d1,deriv2);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 z= filtfilt(d1, deriv3);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 d = filtfilt(d1, deriv4);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 e = filtfilt(d1, deriv5);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 f = filtfilt(d1, deriv6);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 g = filtfilt(d1, deriv7);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 h= filtfilt(d1, deriv8);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 i = filtfilt(d1,deriv9);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 j = filtfilt(d1, deriv10);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 k= filtfilt(d1, deriv11);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 ll = filtfilt(d1, deriv12);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 m = filtfilt(d1, deriv13);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 n = filtfilt(d1, deriv14);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 o = filtfilt(d1, deriv15);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 p= filtfilt(d1, deriv16);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 q = filtfilt(d1, deriv17);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 r = filtfilt(d1, deriv18);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 s = filtfilt(d1, deriv19);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 x = filtfilt(d1, deriv20);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 u = filtfilt(d1, deriv21);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 v= filtfilt(d1, deriv22);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'Passb
 andRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
 w = filtfilt(d1, deriv23);

Best Answer

What you are asking for is not actually optimization, but rather code compactness. Therefor, I'm going to ignore the actual optimization, as it is not my field.
You can use a for-loop to make your code look more compact.
load('C:\Users\del.dell-PC\pfe\base de donnée\patient sans crise\chb01_01_edfm.mat')
Fs=256;
result=cell(23,1);
d1=designfilt('lowpassfir','PassbandFrequency',0.45,...
    'StopbandFrequency',0.5,'PassbandRipple',3,'StopbandAttenuation',...
    60,'DesignMethod','equiripple');
for n=1:23
    deriv=(val(n,:))/2.559375;%-0 doesn't do anything
    t=(0:length(deriv)-1)/Fs;%you are not using this anywhere
    result{n} = filtfilt(d1,deriv);
end
%If you have Matlab 7.0 or later, the line below will work
[a,b,z,d,e,f,g,h,i,j,k,ll,m,n,o,p,q,r,s,x,u,v,w]=result{:};
%If it doesn't, use this line:
[a,b,z,d,e,f,g,h,i,j,k,ll,m,n,o,p,q,r,s,x,u,v,w]=deal(result{:});
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