disp(’ '）disp（’ srs.m ver 2。0 July 3， 2025'）disp（’ by Tom Irvine Email: tomirvine@aol.com’)disp（’ ')disp(’ This program calculates the shock response spectrum')disp（’ of an acceleration time history, which is pre-loaded into Matlab.'）disp（' The time history must have two columns： time（sec） & acceleration’)disp（’ ')％clear t;clear y;clear yy;clear n；clear fn;clear a1；clear a2clear b1;clear b2；clear jnum；clear THM;clear resp;clear x_pos；clear x_neg;%iunit=input（’ Enter acceleration unit： 1= G 2= m/sec^2 ')；%disp(' ’)disp（' Select file input method ');disp（’ 1=external ASCII file ’);disp（' 2=file preloaded into Matlab ’);file_choice = input(’'）；%if（file_choice==1） ［filename, pathname] = uigetfile（'*.＊’); filename = fullfile(pathname， filename）；％ fid = fopen(filename,’r’）； THM = fscanf（fid,’%g %g',[2 inf］); THM=THM'；else THM = input(’ Enter the matrix name： '）;end％t=double（THM（：,1）);y=double(THM(：,2)）;％tmx=max（t）;tmi=min(t);n = length(y）;％out1 = sprintf(’\n %d samples \n’,n);disp(out1)%dt=(tmx-tmi)/(n-1)；sr=1。/dt;%out1 = sprintf(’ SR = ％g samples/sec dt = ％g sec \n’，sr，dt);disp（out1）％fn(1)=input(’ Enter the starting frequency (Hz) '）;if fn（1）〉sr/30。 fn(1)=sr/30.;end％idamp=input(' Enter damping format： 1= damping ratio 2= Q ’）；％disp(' ’）if（idamp==1) damp=input（' Enter damping ratio (typically 0.05） ’）；else Q=input(’ Enter the amplification factor （typically Q=10） '); damp=1./（2。＊Q);end%disp(’ '）disp(’ Select algorithm： '）disp(' 1=Kelly-Richman 2=Smallwood ');ialgorithm=input（’ '）;％tmax=（tmx—tmi) + 1./fn（1）;limit = round（ tmax/dt );n=limit；yy=zeros(1,limit)；for i=1:length（y) yy(i)=y(i）;end ％disp(’ ’)disp（' Calculating response..... ’)%％ SRS engine%for j=1:...
