Don't have a spread sheet?

No, I dont think it is needed here

I'm not familiar with Matlab. I have used Mathcad for years.

You might want to consider getting Mathcad instead, unless you need Matlab for a specific application. Or, do this with Excel.

Anyway, here's your problem as written and graphed in Mathcad. Maybe this will give you some insight on how to formulate it in Matlab. I just picked some dummy values for your constants. For example, t is the running variable, taking values from 1 to 10. I then plot A(t) against t.

What are differences between MATLAB and MATHCAD ?

Both Matlab and Mathcad have been around in various forms since the early 80s. I've never used Matlab, but from what I've seen it looks a lot less user friendly than Mathcad. Mathcad is like having a live notebook. You define an equation in its workspace and it instantly solves it for you. It can handle all algebra and trig functions, and nearly all higher math including differential and integral calculus, and it uses 'realistic' symbology (menu-driven), so that it looks just like you'd write the equation by hand in a notebook. It also allows for 'do loop' programming (for ex.), plus symbologic algebraic solving of equations. It does 2D and 3D graphing and has a 'movie mode' for animations.

From what I've seen of pricing, Mathcad is also much more affordable for the casual user. It is only available for Windows. Here is some info about Mathcad:

http://www.ptc.com/product/mathcad/?gclid=CI6MpbiqjbICFQqR7QodRwoAKA

You can download a 30 day free trial here, if you don't mind giving them some personal info:

http://www.ptc.com/product/mathcad/free-trial/

Dear Friend,
in your example have taken Amount =A, but in plot you are taking a, so kindly take the value as "A" instead of "a".This given blow example will be helpful for you.So go through same.Example
clear,clcformat compacts0 = 12000K = 9600%Define the values of grain diameterdiameter = 0.1:0.1:10;yield = HallPetch(s0,K,d);%Plot the resultsfigure(1)plot(diameter,yield)title('Yield strengths found with the Hall-Petch equation')xlabel('diameter, mm')ylabel('yield strength, psi')

%PASTE THIS INTO COMMAND WINDOW

p=(fill in); %constant, put your number in place of (fill in);

r=(fill in); %constant, put your number in place of (fill in);

dt=(fill in); %constant, put your number in place of (fill in);

n=(fill in); %constant, put your number in place of (fill in);

N=(fill in); %constant, put your number in place of (fill in);

for I=1:N

t(I)=I*dt;

end

A=p*(1+(r/n))^(n*t);

plot(t,A);

grid on;

%END OF PASTE

This should work. Everything after % is a comment and ignored by MATLAB. N is number of steps, dt is step size, total amount of time is N*dt. Put your numbers in place of (fill in). Copy and paste into Matlab command window.

Error in formula... Here is corrected code with some numbers filled in.

p=(100);

r=(.06);

dt=(.05);

n=(1);

N=(1000);

for I=1:N

t(I)=I*dt;

end

A=p*(1+(r/n)).^(n*t); % Note: You need .^ because n*t is a vector!

plot(t,A);

grid on;

lets suppose I have to call m-file inside another m-file (which contains the main program) can any one show me a small syntax or an example.

It will be very helpful, the e-book which I am following is not very clear to me.

Create an m file called RectangleArea.m

In this file:

function [ Area ] = RectangleArea( length, width )
%UNTITLED Summary of this function goes here
% Detailed explanation goes here
Area = length*width;

end

In you main program:

l=5;

w=2;

A=RectangleArea(l,w);

Make sure RectangleArea.m is in your path where Matlab can find it.