MATLAB Answers


Problem in writing code for this profile. Need urgent help

Asked by Debasis Roy on 5 Nov 2018
Latest activity Edited by Debasis Roy on 11 Nov 2018
Respected sir
My profile equation is
U = 1./(mu).*(t_o.*(y-delta)+4.*lambda.*sqrt(t_o.*t_e).*(exp(-lamda./(2.*delta)))+t_e.*lambda.*(1-exp(-y./lambda)))
I want to plot U vs Y wih varying the value lamda and delta.
I want to see how the plot U VS Y behaves for different lamda and y value let s take an example
lamda =0.8 delta 0.6
case 2
lamda =0.8 delta 0.16
case 3
lamda =0.5 delta 0.6
i have written taking one arbitary value but it is error my code
a= 100*(y-(3*(10^-6)));


I do not see any lamda in the assignments you posted? I do not see mu, or t_o, or delta, or t_e in the assignments you posted?
It is not clear how a, b, c, d, e, or u fit into your equations?
In my programme, I have divided it in it parts and also assigned some arbitary value to all constant. I have written each parts with some value and named a,d,e,b,c, & written the final equation

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1 Answer

Answer by Walter Roberson
on 5 Nov 2018

mu = rand();
t_o = rand();
t_e = rand();
deltavals = [0.6 1.1 1.6];
lambdavals = [0.5 0.6 0.7 0.8];
yvals = -2:0.5:2;
[delta, lambda, y] = ndgrid(deltavals, lambdavals, yvals);
U = 1./(mu).*(t_o.*(y-delta)+4.*lambda.*sqrt(t_o.*t_e).*(exp(-lambda./(2.*delta)))+t_e.*lambda.*(1-exp(-y./lambda)));


Sir if I write is it ok? but I am not getting the result. As I want different plot of u vs y corresponding to different values of lambda and delta
deltavals = [0.6 1.1 1.6];
lambdavals = [0.5 0.6 0.7 0.8];
yvals = 0.3:0.1:1;
[delta, lambda, y] = ndgrid(deltavals, lambdavals, yvals);
U = 1./mu.*(t_o.*(y-delta)+4.*lambda.*sqrt(t_o.*t_e).*exp(-lambda./(2.*delta))+t_e.*lambda.*(1-exp(-y./lambda)))
"I want different plot of u vs y corresponding to different values of lambda and delta"
Your inputs are y, lambda, and delta. Your output is u. With three inputs and 1 output, you are dealing with 4 dimensional plotting. However, you are trying to use plot(), which is for 2 dimensional plotting (one output for each input.)
In order to plot with three input variables and one output variable, the Mathworks plotting routines available are slice(), isosurface(), and volumeViewer(). You can also look in the File Exchange for vol3d v2 or
ok, sir thank you for clarifying my doubt. Now I am realizing my fault about this, I have attached one picture for plot i want u vs y plot like this .I am editting it mu=0.6;
deltavals = 0.6 ;
alphavals = [-0.3,- 0.2 ,-0.1,0, 0.1,0.2,0.3 ];
yvals = 0.3:0.1:1;
[ alpha, y] = ndgrid( alphavals, yvals);
U = 1./mu.*(t_o.*(y-delta)+4.*alpha.*sqrt(t_o.*t_e).*exp(- alpha./(2.*delta))+t_e.*alpha.*(1-exp(-y./alpha)))

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