Kitonum

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11 years, 268 days

MaplePrimes Activity


These are replies submitted by Kitonum

@Carl Love  Of course, it is always useful to have an alternative solution. In my opinion, it’s easier to interpret your line 

B:= eval(L, t= solve(L.v = C.v)); 

(without mentioning the plane) how "the vector  L - C  is perpendicular to the vector  v " and rewrite it as

B:= eval(L, t= solve((L-C).v)); 

@tomleslie  I corrected my answer.

@Zeineb To get a solution, we can take arbitrary vectors, but  n  must be specific. This solution can be easily written as a procedure in which  n  will be one of the parameters. But when using this procedure, we must indicate the specific value of .

@JTB2222   Similarly.

@ActiveUser 

You wrote a lot of monotonous code, in each line of which you assign a certain expression to  g , and then do some substitution. If you think Maple is calculating something incorrectly, select only this line from the entire code and ask a specific question.

@Zen 

evalindets(g*a*(a*g+g*b+u^2*(Df-Dr))*b/(Df*Dr*(a+b)*u),`+`, t->simplify(t, {a+b=L}));

                             g*a*(L*g+u^2*(Df-Dr))*b/(u*L*Dr*Df)

@Christian Wolinski  You can have several versions of Maple at the same time in one system. On a fragment of my desktop there are labels of 4 versions (Maple 2017 in two options - Classic and Standard):

@Christian Wolinski  I do not know if this is possible. But you can always tweak Standard worksheet to make it look exactly like Classic worksheet.

@ActiveUser  Probably all your errors are related to the incorrect use of the  subs  command to substitute into the derivative that has not yet been calculated. Use the more "clever" the  eval  command for this.

See example:

A:=subs(x=1, diff(m(x),x));
B:=eval(diff(m(x),x), x=1);
m:=x->x^2;
A;
B;

                                      

 

@ActiveUser 

restart;
solve(m(x)^n=0, m(x));
diff(%, x);

                                                   0
                                                   0

@Carl Love In this case, 4 or 5 different ratings are used ( {-1, 0, 2, 3} or {-1, 0, 1, 2, 3}  ). Of course, to get an unambiguous answer, a more precise statement of the problem is required from OP.

@acer  Thanks for this observation. Take a look at the complement of my answer above.

You are trying to set a tangent to a circle passing through its center. Such a tangent does not exist and TangentLine command returns NULL.

@Ramakrishnan  You can do the same with the  geometry  package. To remove excess parts of circles you can use the  view  option:

restart;
with(plots): with(geometry):
square(Square,[point(A,0,0),point(B,0,4),point(C,4,4),point(DD,4,0)]):
circle(Circle_green,x^2+y^2=4^2, [x,y]):
circle(Circle_blue,x^2+(y-2)^2=2^2, [x,y]):
circle(Circle_red,(x-2)^2+(y-4)^2=2^2, [x,y]):
P:=draw([Square(color=black,thickness=1), Circle_green(color=green,thickness=2), Circle_blue(color=blue,thickness=2), Circle_red(color=red,thickness=2)], view=[0..4,0..4]):
Region_yellow:=inequal({y<sqrt(4^2-x^2),y>sqrt(2^2-x^2)+2}, x=0..2, y=2..4, color=yellow, nolines):
Region_pink:=inequal({y<sqrt(4^2-x^2),y>-sqrt(2^2-(x-2)^2)+4}, x=2..4, y=2..4, color=pink, nolines):
display(P, Region_yellow, Region_pink, axes=normal);

 

@Carl Love  You are right. Another example:

sum((-1)^n, n=1..infinity);
sum((-1)^n, n=1..infinity, formal);

 

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