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## #1 2013-12-31 17:09:08

prathima
Member
Registered: 2013-09-19
Posts: 33

### scilab programmes

i need scilab progam for
1. to obtain fibonacci series
2.to obtain non fibonacci series
3. to find the root of the equation f(x,a)=a*cos(x)-x*e(-a*x) for different values of a∈[1,10]
it is imporant for my exams

Last edited by prathima (2013-12-31 17:27:06)

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## #2 2013-12-31 18:48:23

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

I do not program in Scilab. Best I can do is pseudocode, you will and should write them.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #3 2013-12-31 19:13:48

prathima
Member
Registered: 2013-09-19
Posts: 33

ok....

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## #4 2013-12-31 19:30:59

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

1. to obtain fibonacci series

I guess you mean Fibonacci sequence.

1) x1 = 1;
2) x2 = 1;
3) h = x2;
4) x2 = x1 + x2;
5)Print[x2]
5) x1 = h;
6) Goto 3

Remember to debug it if necessary. I am partying.

2.to obtain non fibonacci series

What is a non Fibonacci sequence specifically?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #5 2013-12-31 20:09:36

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

non fibonacci sequence is 4,6,7,9.10,11,12,14,15,16,17,18,19,20,...

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## #6 2013-12-31 21:15:19

gAr
Member
Registered: 2011-01-09
Posts: 3,479

### Re: scilab programmes

The example for Fibonacci is there: http://hkumath.hku.hk/~nkt/Scilab/IntroToScilab.html

for 3, you can use newton-raphson,

E.g. in python,

from math import exp, sin, cos
t=3
told=1
a=5
while abs(t-told) > 0.00000000001:
told=t
t=t - (a*cos(t) - t*exp(-a*t))/(a*t*exp(-a*t) - a*sin(t) - exp(-a*t))
print t

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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## #7 2013-12-31 22:18:47

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

i dnt knw hw to insert the condition that a∈[1,10] in newton raphson method

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## #8 2013-12-31 22:24:05

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

Hi;

Is it continuous?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #9 2014-01-01 01:04:11

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

i dont know.
in question it is not clear that a is continous or not

Last edited by prathima (2014-01-01 01:06:38)

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## #10 2014-01-01 01:06:16

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

What values can a take? a = 1,2,3,4... integers? Or any value from 1 to 10 like 7.27?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #11 2014-01-01 01:10:46

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

question is
scilab program to find the root of eqn f(x,a)=a*cos(x)-x*e^(-a*x) for different values of a∈[1,10]

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## #12 2014-01-01 01:13:30

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

Why not use the code gAr provided for python.

from math import exp, sin, cos
t=3
told=1
input[a];
while abs(t-told) > 0.00000000001:
told=t
t=t - (a*cos(t) - t*exp(-a*t))/(a*t*exp(-a*t) - a*sin(t) - exp(-a*t))
print t

I just changed one line to Input[a]. Now you can enter any a you want.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #13 2014-01-01 01:23:58

prathima
Member
Registered: 2013-09-19
Posts: 33

thank you:)

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## #14 2014-01-01 01:25:07

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

scilab program to obtain non fibonacci series

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## #15 2014-01-01 01:33:21

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

Generate the fibonacci numbers like I did in the first post and then an array of {1,2,3,4,5....}. When you get a fibonacci number cross it out by zeroing the array element.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #16 2014-01-01 01:46:46

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

zeroing the array element means

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## #17 2014-01-01 01:48:51

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

Putting a zero in the array element.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #18 2014-01-01 01:50:04

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 20,182
Website

### Re: scilab programmes

prathima wrote:

it is imporant for my exams

I hope you do not mind me asking but what grade student are you?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'You have made another human being happy. There is no greater accomplishment.' -bobbym

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## #19 2014-01-01 01:52:40

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

i am not getting

Do you know what an array is?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #20 2014-01-01 01:58:32

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 20,182
Website

### Re: scilab programmes

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'You have made another human being happy. There is no greater accomplishment.' -bobbym

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## #21 2014-01-01 02:00:26

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 15,917

### Re: scilab programmes

Hi prathima

Basically, just take the array {1,2,3,4,5,6,...} and put a zero instead all the numbers which are Fibonacci numbers.

Last edited by anonimnystefy (2014-01-01 02:00:47)

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #22 2014-01-01 02:00:53

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

He can not do that yet.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #23 2014-01-01 02:01:26

prathima
Member
Registered: 2013-09-19
Posts: 33

### Re: scilab programmes

in scilab array set values in vector form for ex. A=[1 2 3]

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## #24 2014-01-01 02:02:20

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

Do you know how to access an individual array element?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online

## #25 2014-01-01 02:03:41

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 93,581

### Re: scilab programmes

What is pg?

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Online