25 Reputation

7 years, 111 days

System of linear equations...

Maple

I have to find the tangent lines to the circle x^2+y^2+6*x-8*y+25 = 1/16 which pass at the O(0;0)

So i make a general line y=m * x

Ho can i put m*x instead of y in the circle and calculate the delta of the equation that i get?

Plotting squares...

I have to plot 10 squares each one inscribed into each other. After the first one, which is a square with a side of 10m, each following square has got each edges wich are distant from the previous edges (side of the previous square)/4 metres, on the

sides of the previous square

How can i draw it?

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Find repetitions in a list...

Maple

I have to generate a random list of 30 elements and i have two variables: s, which is a counter for all the list which have got at least a repetition and variable n, for each list who has not repeated values, as in the code below.

I don't understand why, when i sum s and m i get a value which is not 100, why?

```for i by 1 to 100 do
list:=RandomTools[Generate](list(integer(range = 1 .. 365), 30));
if numelems(FindRepetitions(lista)) >= 1 then
s:=s+1;

else		n:=n+1;

end if;
end do;```

Nested loops and matrix...

Maple

I have to find which column of a matrix contains repeated elements, i have done it in this but i'm afraid that the nested loops don't run correctly:

```for j by 1 to 10 do
for i by 1 to 30 do
h:=Dati[i,j];
for x by 1 to 30 do

if Dati[x,j] = h then
if x <> i then
return j;
end if;
end if;
end do;
end do;
end do;```

Matrix and lists...

Maple

How can i convert each column of a matrix(30X10) in a list?

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