260 Reputation

6 years, 263 days

Social Networks and Content at Maplesoft.com

PH.D in Applied Mathematics

thanks of programmer...

Dear mehdi Jafari

hi. hope you to be in good health and have funny times.

thanks a lot for your cooperation. the problem solved successfully by you and Mr. Carl's efforts.

I pray to God you and your family always be happy and with best wishes.

sincerely

thanks so much...

Dear mehdi

now i want to use the J's indexes namely a_1,a_2,...,a_5 and b_1,b_2,...,b_5 as the coefficients of an approximation like follows:

x(t)=∑a_if_i(t);

u(t)=∑b_if_i(t);

where f_i(t)'s are known functions. how can i do so?

note that in J  we have 2 vector(vectore in vector) and i want computed part of a_i's and b_i's

thanks again

best wishes

thanks...

Dear Carl

thanks a lot for your valuable remark. you are right and the numelems(C) command gives better answer than nops(C). Please accept my best wishes and much grateful for your guides.

now i want to use the J's indexes namely a_1,a_2,...,a_5 and b_1,b_2,...,b_5 as the coefficients of an approximation like follows:

x(t)=∑a_if_i(t);

u(t)=∑b_if_i(t);

where f_i(t)'s are known functions. how can i do so?

thanks again

best wishes

Thanks...

Dear Mehdi Jafari

Hi. please accept my best wishes and much grateful of your attentions and solving this problem. I don't know how explain my interest for your answer. hope you to be in good health forever and have times full of happiness.

Best wishes

Correct of program...

Thanks alot

the major program with outputs are given.

I have checked the matrix dimensions and they are correct.

I will be so grateful if yousee the program again.

Dear Preben Alsholm

thanks alot for your nice and comprehensive solution. it works good and the huge part of my problems in my dissertation is now solved. i have alot of problems and i will send them to you to guide me about them.

again I am grateful and hope you to be more and more successful in all aspect of your life.

Best wishes

laplace tarnsform...

Dear Preben Alsholm

Hi. hope you to be in good health and have nice times.

is there the same way for the solution of dx/dt=16*t*x(t-0.25) by laplace transform??

if so, please guide and help me to do it( if it dosn't consuming your valuable times)

best wishes

Thanks...

So thanks for your solution. you are right. It is another issue that I have sent the wrong. your answer is nice and exact and i am grateful of you. may i have your guide if i have other problems?

best wishes

Calculation By Matrix...

Dear Carl Love
i can't say how much i am thankful of your answer. it is simple, more flexible and very fast. alittle mistake was in program and i have found and corrected it and now it works like clock...

again i am grateful  and hope you best days

calculation with matrix...

@Preben Alsholm
Hi Dear

So much Thanks for your answer. i am completely new user of maple soft and so you should justify me to do wrong.

my major idea is  to solve a delay differential equation like: x'(t)=x(t-1)+2*t and for this i have used fourier series expansion for the x(t) and t and x(0)=x0.so i want program to plot both exact and approximation solution in one plot and verfying that the approximation is not so bad.

i will be so grateful if i have your suggestion.

best wishes

 1 2 3 4 5 Page 5 of 5
﻿