1、 endfunction pushbutton1_Callback(hObject, eventdata, handles)ft=get(findobj(tag,ft) ,stringft=sym(ft);axes(handles.axes1)claezplot(ft)grid onanswer=char(fourier(ft);set(handles.fw,answer);fw=sym(get(handles.fw,)axes(handles.axes2)ezplot(fw)fw=get(findobj(fwfw=sym(fw);answer=char(ifourier(fw);set(ha
2、ndles.ft,ft=sym(get(handles.ft,function x=Heaviside(t)x=(t0)answer=char(laplace(ft);set(handles.fs,fs=sym(get(handles.fs,ezplot(fs)fs=get(findobj(fsfs=sym(fs);answer=char(ilaplace(fs);gridon fn=get(findobj(fnfn=sym(fn);syms n z;answer=char(ztrans(fn,n,z);fz=sym(answer)fz=simple(fz)answer=char(fz)set
3、(handles.fz,answer)syms n zfz=get(findobj(fzfz=sym(fz);answer=char(iztrans(fz,z,n);set(handles.fn,fn=sym(get(handles.fn,n=0:1:10;fn=2.n.*nstem(n,fn,filled)n = str2double (get(handles.edit1, );t=-2:2;F0=0.5;Fn=F0*ones(1,length(t);for i=1:2:nFn=Fn+cos(pi*i*t)*sinc(i/2);plot(t,Fn,m-linewidth,2);axis(-2
4、 2 -0.2 1.2);syms tn=-60:-1,eps,1:60;A=1;T = str2double (get(handles.tt, tao = str2double (get(handles.tao, F0=int(A,t,-tao/2,tao/2)/Tf=A*exp(-j*n*2*pi/T*t);Fn=int(f,t,-tao/2,tao/2)/T;Fn=simple(Fn)Fn=subs(Fn,n,nstem(n,Fn,line(-60 60,0 0)xlabel(),ylabel(Fnr = str2double (get(handles.r, l = str2double
5、 (get(handles.l, c = str2double (get(handles.c, b=r*c 0;a=r*l*c l r;zs=roots(b)ps=roots(a)plot(real(zs),imag(zs),ohold onplot(real(ps),imag(ps),xw=0:s=j*w;h=polyval(b,s)./polyval(a,s);hm=abs(h);plot(w,hm);w)ylabel(hmhp=angle(h)*180/pi;plot(w,hp);hpsyms sxs=poly2sym(b,s)/poly2sym(a,s)xt=char(ilaplace
6、(xs);set(handles.im,xt);xt=sym(get(handles.im,axes(handles.sss)ezplot(xt)b1=r*c 0;a1=r*l*c l r 0;xs1=poly2sym(b1,s)/poly2sym(a1,s)xt1=char(ilaplace(xs1);,xt1);xt1=sym(get(handles.im,axes(handles.iii)ezplot(xt1)fs=s/(s2+s+1)ft=ilaplace(fs)syms t uf=Du+2*u=2*exp(-t),u(0)=0u=dsolve(f)ezplot(u)u =2*exp(-t)-2*exp(-2*t)
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