## Ramakrishnan

Ramakrishnan Vaidyanathan

7 years, 74 days

## Social Networks and Content at Maplesoft.com

With twenty years of Industrial experience and twenty years of teaching experience, I am now as retired Professor, using Maple to teach mathematics subject for students studying X to XII standards. Published XII Mathematics books.

## How to do calculations like this?...

 = Now insert after = sign with Text mode C Text mode in the context tool bar [Or simply go next to equal to sign andyou can see these modes appear.Type now whatever you want.  = a.3.4= Other way is use substitution in the command itself as below.  =

You have to type after getting the answer. or use substitution in the command line itself.

(a=7)*3*4 and press (control plus =)

Hope it satisfies you. Cheers. Ramakrishnan v

## eigenvalue problem...

The given equation with unknowns is

=

 (1)

 (2)

 (3)

Above Equn(3) is second order differentiation with y

 (4)

 (5)

 (6)

Above Equn (6) Second order differentiation with x

 (7)

 (8)

 (9)

Above Equn (9) Second order differentiation with xy

Equn 3, 6 and 9 are 2nd differential wrt to y, y and xy.

At x = 0, the condition is

 (10)

 (11)

At x = 20, the condition is

 (12)

 (13)

At y = 9, the condition is

 (14)

 (15)

 (16)

At y =-9, the condition is

 (17)

 (18)

 (19)

At y = 9, the condition is

 (20)

 (21)

 (22)

At y = -9, the condition is

 (23)

 (24)

 (25)

 (26)

 (27)

 (28)

But solving equations  is difficult for me.

Anyone can comment my work.

my_attempt_ets_you_6_equations_for_4_unknown.mwMy attempt has brought 4 equations for 4 unknowns. But then solving them is not easy because of arcsin terms. Hope my attempt is useful to you and take you near the answer. Cheers. Ramakrishnan V

 In radian text box type the following command In degree text box type the following command

## Linear ODE of second order...

 (1)

 sol1 := dsolve([diff(diff(y(x),x),x) = -(x^2+1)*y(x)+k, y(-1) = 0, y(1) = 0]);  # returned NULL

 (2)

 (3)

 (4)

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 (7)

I am sending details possible here.

## A problem of conversion of units SI to F...

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For unit conversion , all you need to do is just right cick the answer (blue color answer) and select unit formating and in the menu that pops up select Unit System as SI. You get the conversion automatically.

 (6)

 (7)

For numerical answer conversion , all you need to do is just right cick the answer (blue color answer) and select Numerical Formating and in the menu that pops up select Fixed, select decimal places as 2 and click 'apply'. You get the numerical conversion automatically.

 (8)

 (9)

Please note that lb is mass unit and therefore can not be converted to force unit Newton.

pondal is the force unit in FPS and hence convertible to Newton in SI unit.

 (10)

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One poundal is one pound mass acclerated by 1 ft/s2

 (12)

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I attach herewith my document . Hope this clarifies the usage so simple.

Simply right click and and select the unit you need. It gives without any waste of second!

## Solving fractional differential equation...

 >
 (1)
 >
 (2)
 >
 (3)
 >
 (4)
 >
 (5)
 >
 (6)
 >
 (7)
 >

Go to calculas pallet. Select the d^2/dxdy f and modify the functionf as u require using the pallet expression.

I shall attach an example. Hope u can view this. The error code shown is because i did not use pallet expression.

The second one is correctly evaluated since i used expression pallet to define the function f as x/y.

Cheers. Ramakrishnan V

## How can I solve system of nine different...

 (1)

 (2)

 (3)

 (4)

 (5)

 (6)

 (7)

 (1)

 (2)

 (3)

 (4)

 (5)

 (6)

 (7)

I hv answered first part. Solving two diff. equns. as an example. You can proceed in a similar way for any number of equations!

Graph plotting is possible once a solution is obtained in an equation form. Any equation can be plotted with a simple plot command.

Ramakrishnan V

## Animation of Garage door opening...

I ran your program in Maple18 and the error that comes is

Error, unable to match delimiters

This error appears when there are unmatched delimiters within an expression. In Maple, the bracket delimiters (, ), [, ], {, }, <, and > work in pairs, and an error occurs if a delimiter is used and cannot be matched with its pair.

Hope in any way it helps you.

## readline - output not being cleared...

#return "foo";

The above statement needs to be

#return "f()";

it will work.

 >
 >
 Enter the number of players:
 Number of players is 6
 >

## Error in Solve Function in Maple 18.02...

solve(2*y-(x-1)^2=2,y) is in text format and hence invalid input.

Ensure that all the characters are in maths format ( maths 2D format)

solve(2*y-(x-1)^2 = 2, y);
print(`output redirected...`); # input placeholder
1 2 3
- x - x + -
2 2
solve(2*y-(x-1)^2-2 = 0, y);
print(`output redirected...`); # input placeholder
1 2 3
- x - x + -
2 2error_in_solving_Maple18.2SolutionByVR.mw

 (1)

 (2)

 (3)

 (4)

 (5)

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 (7)

 (8)

Capital S not allowed

 (9)

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## or loop issues...

for i to 9 do if A(i) = 1 then A(k) := 100 end if end do

will work

Use i inside loop also

Assign not equation

A:= 0 and not A = 0

Hope this clarifies. I am also learner and hope to learn more from mistakes from peer group as well. Cheers.

## to plot procedure- i am also unclear...

All 3 procedures given below give answer plot.

filter := proc (x) options operator, arrow; if x < 10 then 1-(1/10)*x else 0 end if end proc; plot('filter(x)', x = 0 .. 20)

filter := proc (x) options operator, arrow; if x < 10 then 1-(1/10)*x else 0 end if end proc; plot('filter(x)', 'x' = 0 .. 20)

filter := proc (x) options operator, arrow; if x < 10 then 1-(1/10)*x else 0 end if end proc

plot('filter(x)');

All the above three works. May be the plot command takes default values for x even if not given as per my third command above.

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