MATLAB: Matlab 2014a parachute problem

functionmatlab 2014aparachute equation

Here is the code

function dummy=parachute(c)
m=68;
g=9.81;
t=10;
v=45;
c=0.1:20:100;
dummy=-v+(g*m./c).*(1-exp(-c/m)*t);
fplot('parachut',[0,20])
grid on
xlabel('c')
ylabel('f(c)')

here is the error message I am receiving

Maximum recursion limit of 500 reached. Use
set(0,'RecursionLimit',N) to change the limit. Be
aware that exceeding your available stack space can
crash MATLAB and/or your computer.
Error in ismember>ismemberlegacy

I want the program to run . then I have to make a function to find "c" at 10 seconds by graphic means in the command window.

I am stuck with this error messages or another messages.

Best Answer

Put this command into your script:

workspace;

And then set a breakpoint near the end of your function. Make sure there are no variables that are not supposed to be there, like two variables, one of which is a misspelling of another. Try

which fplot

to make sure you don't have two functions of that name, where it might be using the one you did not expect.

When you ran it on each computer, was it the actual file, like you copied it from a flash drive or network drive? Or did you type it in on each one? Because the code looks fine, and there is no recursion that I can see and the code runs fine on at least two computers.

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MATLAB: Matlab determine a curve

You have a little noise on your y-data, as you can see from this example code. You might need to smooth that out first.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
folder = 'C:\Users\joo\Documents\Temporary';
fullFileName = fullfile(folder, 'livro1.xlsx');
% Check if file exists.
if ~exist(fullFileName, 'file')
  % File doesn't exist -- didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
[num txt raw] = xlsread(fullFileName);
x = num(:, 1);
y = num(:, 2);
% Plot x
subplot(2,2,1);
plot(x, 'b-');
xlabel('Element Number', 'FontSize', fontSize);
ylabel('X', 'FontSize', fontSize);
title('X', 'FontSize', fontSize);
grid on;
% Plot y
subplot(2,2,2);
plot(y, 'b-');
xlabel('Element Number', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
title('Y', 'FontSize', fontSize);
grid on;
% Plot curves
subplot(2,2,3);
plot(num(:, 1), num(:, 2), 'b-');
title('X', 'FontSize', fontSize);
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
grid on;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Calculate distance from (50,360) of every point.
distances = sqrt((x - 50).^2 - (y - 360).^2)
subplot(2,2,4);
plot(distances, 'b-');
title('Distance from (50, 360)', 'FontSize', fontSize);
xlabel('index', 'FontSize', fontSize);
ylabel('Distances', 'FontSize', fontSize);
grid on;
% Find valleys in distances to find out where it turned around.
[valleys, indexesAtMins] = findpeaks(-distances)
% Plot them.
hold on;
plot(indexesAtMins, -valleys, 'r*');

MATLAB: How to set a fixed color scheme for pcolor

You do know that the colors depend not on the value of a particular element, but on the slope of a plane fitted between the 4 elements at the corner, don't you? Did you see this in the help: "With shading interp, each cell is colored by bilinear interpolation of the colors at its four vertices, using all elements of C." And you know that you're "missing" the last row and column because you read this: "The last row and column of C are not used" What is the exact call to pcolor that you used? Then, explain to me why you want to use pcolor() instead of imshow() or image().

Anyway, if you want blue to be the largest value, just flip jet. See this demo:

m = randi(3, [5 5])
pcolor(m)
flippedJetColorMap = flipud(jet(256));
colormap(flippedJetColorMap);
colorbar

Whoa! Wait a minute! Did you notice that all the 1's don't have the same color, and all the 2's don't have the same color, and that all the 3's don't have the same color? And did you notice that there are only 4 by 4 cells displayed, not 5 by 5 like the size of my "m" matrix? That doesn't seem intuitive! Now you know why I don't recommend pcolor. But at least the colormap is flipped like you want, though it doesn't really apply to anything.

Best Answer

Related Solutions

MATLAB: Matlab determine a curve

MATLAB: How to set a fixed color scheme for pcolor

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