what is wrong with this code

figure 
x=0:0.01:2;
plot(conc,x,'r-')
xlabel('distance from the source (m)')
ylabel('concentration (mol/l')
title('the concentration of a substance with distance from initial source')

Error using CES_StudentID_empty>conc

Too many output arguments.

Error in CES_StudentID_empty (line 48)

plot(conc,x,'r-')

[Cameron B]

What is the variable conc?

[Walter Roberson]

We should suspect from the code and error that conc is not a variable, and is instead a function that is defined as not returning any output.

[Image Analyst]

What is that? That's a script, not a function.

Answer 1

[Image Analyst]

Try this:

% Demo by Image Analyst.
clc;    % Clear the command window.
fprintf('Beginning to run %s.m ...\n', mfilename);
close all;  % Close all figures (except those of imtool.)
clearvars;
workspace;  % Make sure the workspace panel is showing.
format short g;
format compact;
fontSize = 16;

t=86400;
v=10.^-5;
D=10.^-7;
x=0:0.01:2;
%Calcuate the concentration in ( mol/l)
conc = (1./sqrt(4 * pi * D * t)* exp(-1 * ((x - v * t) .^ 2 ./ 4 * D )));
plot(conc, x, 'r-', 'LineWidth', 3)
grid on;
xlabel('Distance from the source (m)', 'FontSize', fontSize)
ylabel('Concentration (mol/l', 'FontSize', fontSize)
title('The concentration of a substance with distance from initial source', 'FontSize', fontSize)

fprintf('Done running %s.m\n', mfilename);

Answer 2

[Walter Roberson]

You currently have

t=86400;
v=10.^-5;
D=10.^-7;
x=0:0.01:2;
%Calcuate the concentration in ( mol/l)
conc=(1./sqrt(4 * pi * D * t)* exp(-1 * ((x - v * t) .^ 2 ./ 4 * D )));

stored in conc.m . Rename that file to calculate_conc.m . Then

figure 
calculate_conc;
plot(conc,x,'r-')
xlabel('distance from the source (m)')
ylabel('concentration (mol/l')
title('the concentration of a substance with distance from initial source')