what is wrong with this code

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JJ
JJ 2021-4-28
回答： Image Analyst 2021-4-28
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-')
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Walter Roberson
Walter Roberson 2021-4-28
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
Image Analyst 2021-4-28
What is that? That's a script, not a function.

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采纳的回答

Image Analyst
Image Analyst 2021-4-28
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);

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-4-28
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')

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