Heated rod with ice bath (Example 9.5.2) L := 50; u0:=100; k:=0.15; IiNd IiQrIg== JCIjOiEiIw== u := (x,t,N) -> (4*u0/Pi)* sum((1/(2*j-1)) * exp( -((2*j-1)*Pi/L)^2*k*t ) * sin((2*j-1)*Pi*x/L),j=1..N); Zio2JUkieEc2IkkidEdGJUkiTkdGJUYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLCQqKEkjdTBHRiUiIiJJI1BpRyUqcHJvdGVjdGVkRyEiIi1JJHN1bUc2JEYwSShfc3lzbGliR0YlNiQqKCwmSSJqR0YlIiIjRjFGLkYxLUkkZXhwR0Y0NiMsJCosRjhGOkYvRjpJIkxHRiUhIiNJImtHRiVGLjklRi5GMUYuLUkkc2luR0Y0NiMqKkY4Ri5GL0YuOSRGLkZARjFGLi9GOTtGLjkmRi4iIiVGJUYlRiU= plot3d(u(x,t,50),x=0..L,t=0..2000,color=black,style=wireframe,axes=boxed); 6'-%*AXESSTYLEG6#%$BOXG-%+AXESLABELSG6%Q"x6"Q"t6"Q!6"-%%GRIDG6&;$""!""!$"#]""!;$""!""!$"%+?""!X,I)anythingG%*protectedG6"6"[gl'!%"!!#\bm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eated rod with insulated ends (Example 9.5.3) f := x -> piecewise(0<x and x<=25, 4*x, 25<x and x<=50, 200-4*x); Zio2I0kieEc2IkYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLUkqcGllY2V3aXNlRyUqcHJvdGVjdGVkRzYmMzIiIiE5JDFGMCIjRCwkRjAiIiUzMkYyRjAxRjAiI10sJiIkKyMiIiJGMCEiJUYlRiVGJQ== plot(f(x),x=0..50, color=black); 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 Fourier series of f(t) a:= n-> (2/L) * int(f(x)*cos(n*Pi*x/L),x=0..L); Zio2I0kibkc2IkYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLCQqJkkiTEdGJSEiIi1JJGludEc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkdGJTYkKiYtSSJmR0YlNiNJInhHRiUiIiItSSRjb3NHRi82IyoqOSRGOEkjUGlHRjBGOEY3RjhGK0YsRjgvRjc7IiIhRitGOCIiI0YlRiVGJQ== f2 := (x,N) -> a(0)/2 + sum(a(n)*cos(n*Pi*x/L),n=1..N); Zio2JEkieEc2IkkiTkdGJUYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLCYtSSJhR0YlNiMiIiEjIiIiIiIjLUkkc3VtRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliR0YlNiQqJi1GLDYjSSJuR0YlRjAtSSRjb3NHRjQ2IyoqRjtGMEkjUGlHRjVGMDkkRjBJIkxHRiUhIiJGMC9GOztGMDklRjBGJUYlRiU= plot({f2(x,10),f(x)},x=0..50); 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 u2 := (x,t,N) -> a(0)/2 + sum(a(n) * exp(-(n*Pi/L)^2*k*t) * cos(n*Pi*x/L),n=1..N); Zio2JUkieEc2IkkidEdGJUkiTkdGJUYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLCYtSSJhR0YlNiMiIiEjIiIiIiIjLUkkc3VtRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliR0YlNiQqKC1GLTYjSSJuR0YlRjEtSSRleHBHRjU2IywkKixGPEYySSNQaUdGNkYySSJMR0YlISIjSSJrR0YlRjE5JUYxISIiRjEtSSRjb3NHRjU2IyoqRjxGMUZCRjE5JEYxRkNGR0YxL0Y8O0YxOSZGMUYlRiVGJQ== plot3d(u2(x,t,50),x=0..L,t=0..2000,color=black,style=wireframe,axes=boxed); 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