I DONT KNOW HOW TO CODE AND PLOT THIS EQUATION

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korukosheep
korukosheep 2020-12-6
评论： Image Analyst 2020-12-7
i been trying to code and plot this Midilli equation but it's very hard for me and i dont know how to start it
MR= a•exp(-k(t^n))+b•t
where any numbers can be put in a,b,k,n,t

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回答（1 个）

Image Analyst
Image Analyst 2020-12-6
Did you try the plot() function?
% Ask user for four floating point numbers.
defaultValue = {'4', '2', '3', '3'};
titleBar = 'Enter a value';
userPrompt = {'Enter a : ', 'Enter b : ', 'Enter k : ', 'Enter n : '};
caUserInput = inputdlg(userPrompt, titleBar, 1, defaultValue);
if isempty(caUserInput),return,end % Bail out if they clicked Cancel.
% Convert to floating point from string.
a = str2double(caUserInput{1})
b = str2double(caUserInput{2})
k = str2double(caUserInput{3})
n = str2double(caUserInput{4})
t = linspace(0, 3, 1000);
MR = a*exp(-k*(t.^n))+b*t;
% where any numbers can be put in a,b,k,n,t
plot(t, MR, 'b-', 'LineWidth', 2);
grid on;
xlabel('t', 'FontSize', 20);
ylabel('MR', 'FontSize', 20);
title('MR vs. t', 'FontSize', 20);
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Image Analyst
Image Analyst 2020-12-7
Maybe it's some sort of regional keyboard setting problem. Try changing it. If the decimal point shows up in some other character, maybe you can try input() instead of inputdlg() to enter numbers directly. Otherwise, I've created a version with decimal points in there using the defaults you gave, and also gives you the value for t = 11 exactly.
% Ask user for four floating point numbers.
defaultValue = {'1.1143', '0.00321', '0.1791', '1.3215'}; % a = 1.1143 K = 0.1791 n = 1.3215 b = 0.00321 t = 11
titleBar = 'Enter a value';
userPrompt = {'Enter a : ', 'Enter b : ', 'Enter k : ', 'Enter n : '};
caUserInput = inputdlg(userPrompt, titleBar, 1, defaultValue);
if isempty(caUserInput),return,end % Bail out if they clicked Cancel.
% Convert to floating point from string.
a = str2double(caUserInput{1})
b = str2double(caUserInput{2})
k = str2double(caUserInput{3})
n = str2double(caUserInput{4})
t = linspace(8, 12, 1000);
MR = a*exp(-k*(t.^n))+b*t;
% where any numbers can be put in a,b,k,n,t
plot(t, MR, 'b-', 'LineWidth', 2);
grid on;
xlabel('t', 'FontSize', 20);
ylabel('MR', 'FontSize', 20);
title('MR vs. t', 'FontSize', 20);
% Let's see where it is for t = 11
t11 = 11;
MR11 = a*exp(-k*(t11.^n))+b*t11
xline(t11, 'LineWidth', 2, 'Color', 'r');
yline(MR11, 'LineWidth', 2, 'Color', 'r');
caption = sprintf('MR vs. t. MR(%.1f) = %f', t11, MR11);
title(caption, 'FontSize', 20);
If it still doesn't work, post your code.

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