Hi, after solving an equation and inserting it in the original equation the result is not equal to zero!!

What is the problem?

in the attached file below I obtained 'q' and then I put it in the eq (3), but the result is not zero!!

Please help me.

555.mw

I am looking for an elegant way in which to find a vector that is perpendicular to another vector.  The attached worksheet shows one method, but this can result in a divide by zero error.  I could write a procedure to detect and avoid the divide by zero error, but this feels like a sledgehammer to crack a nut :-)

Another method might be to rotate the vector by PI/2, but I'm not sure how to do this.

Any suggestions would be gratefully received!

Perpendicular_Vectors.mw

Hi, 
I need do generate a large number of matrices (always with the same dimensions) whose each column is a random sample of a different random variable.
I wrote a rather simple procedure to do that (see below a notional example). Let T and S the time and the memory size required for a single execution of this procedure, then its execution N times needs a time N*T and a size N*S.
If time is not a problem, the increase in memory size is extremely constraining.
How should I write this procedure in order that N executions of it use a memory of the order of S and not N*S?
 

Download Not_Efficient.mw

I keep getting this datatype float[8] error, can some1 please help me. 
upload the mw file here faq.mw

Also i have a working for lopp and want to make a procedure. 
Any suggestions will be helpful as well. Thanks.

This is a given set of equations (from a classifier problem in deep learning):

I tried to replicate the expression in Maple, but it was unsuccessful. 

Q_MaplePrime20200417.mw

Would you tell me how to make it work?

Then, please let me know how to refer to a previous result (equation number) in the current expression. 

The last line above (and the attached Maple document) shows my attempt, It did not work. 

Thank you/Be healthy!

Hello,

How to solve this error? Thank you

Sistem := diff(E[1](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dE1), diff(L[1](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dL1), diff(P[1](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dP1), diff(M[1](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dM1), diff(E[2](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dE2), diff(L[2](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dL2), diff(P[2](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dP2), diff(M[2](t), t) = subs(E[1] = E[1](t), L[1] = L[1](t), P[1] = P[1](t), M[1] = M[1](t), E[2] = E[2](t), L[2] = L[2](t), P[2] = P[2](t), M[2] = M[2](t), Data, dM2);
Error, invalid input: subs received Data, which is not valid for its 9-th argument

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diff(z, t)+(diff(R, x))*L+A*(diff(L, x))+diff(k, x, x)-(diff(k, t, t)) = 0

Thanks.

D(u(x,t),t,t)=c^2*D(u(x,t),x,x);

Where u(x,0)=f(x),D[2](u)(x,0)=g(x),u(0,t)=0=u(L,t),L=2

please do this as mentioned above

Dear all

I use Maple 2018 and have following problem:

I define following procedure and want to plot it. However Maple displays the coordinate system but does not plot anything nor gives and error message. Hope you can help.

Thanks

Murad

b:=proc(n)
local b,i:
 for i from 0 to n do
  if i=0 then
   b[0]:=0:
  elif i=1 then
   b[1]:=1:
  else
   b[i]:=(b[i-1]+b[i-2])/2:
  end if:
 end do:

return b[n]

end proc:

plot(b,0..10)