Plot function only plots one coordinate

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Tomas White on 8 Feb 2022

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Commented: Star Strider on 9 Feb 2022

For my matlab introduction class Im trying to plot a graph by feeding it coordinates obtained by the (x =) and (y=) equations. The problem is that the obtained graph has no points on it; At the moment I dont know how to proceed.

clear 
clc
fprintf('Parabolic motion 1\n');
fprintf(1,'Provide an input for the following constants\n');
V0 = input('Initial velocity = ');
b0 = input('Angle =  ');
C = input('"C" = Proyectile mass / air resistance coefficient =  ');
t = input('Number of desired plotted points =  ');
vy = V0*cosd(b0)
vx = V0*sind(b0)
x=0
y=0
    i=0
    while (i <= t)
        
        x= C * vx * (1-2.718^(-(i)/C));
        y= (C * vy + 9.8 * ((C)^2))*(1-2.718^(-(i)/C))-9.8 * C * (i);
        
        disp(x)
        disp(y)
       
        plot(x,y)
      
        xlabel('Traveled distance (m)')
        ylabel('Altitude (m)')
        
        i++ ;
        
    end 

If anyone has a few minutes to take a look at this, I'd really appreciate it. I can't seem to find a solution. Thank you!

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Answer 1

Star Strider on 8 Feb 2022

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https://www.mathworks.com/matlabcentral/answers/1645860-plot-function-only-plots-one-coordinate#answer_891615

MATLAB does not use C increment syntax.

One approach would be to subscript them and plot them at the end. That is definitely the more efficient approach.

% clear

% clc

fprintf('Parabolic motion 1\n');

Parabolic motion 1

fprintf(1,'Provide an input for the following constants\n');

Provide an input for the following constants

% V0 = input('Initial velocity = ');

% b0 = input('Angle = ');

% C = input('"C" = Proyectile mass / air resistance coefficient = ');

% t = input('Number of desired plotted points = ');

V0 = 420;

b0 = 60;

C = pi;

t = 25;

vy = V0*cosd(b0)

vy = 210

vx = V0*sind(b0)

vx = 363.7307

x=0

x = 0

y=0

y = 0

i=1

i = 1

while (i <= t)

x(i) = C * vx * (1-2.718^(-(i)/C));

y(i) = (C * vy + 9.8 * ((C)^2))*(1-2.718^(-(i)/C))-9.8 * C * (i);

disp(x)

disp(y)

% plot(x,y)

% xlabel('Traveled distance (m)')

% ylabel('Altitude (m)')

i = i+1 ;

end

311.4967

175.4214

311.4967 538.0799

175.4214 294.6306

311.4967 538.0799 702.8968

175.4214 294.6306 372.9508

311.4967 538.0799 702.8968 822.7848

175.4214 294.6306 372.9508 421.5283

311.4967 538.0799 702.8968 822.7848 909.9915

175.4214 294.6306 372.9508 421.5283 448.4711

311.4967 538.0799 702.8968 822.7848 909.9915 973.4258

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407 1.1413

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035 108.9705

1.0e+03 * 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407 1.1413 1.1417

175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035 108.9705 78.4408

1.0e+03 * Columns 1 through 22 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407 1.1413 1.1417 Column 23 1.1419

Columns 1 through 22 175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035 108.9705 78.4408 Column 23 47.8409

1.0e+03 * Columns 1 through 22 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407 1.1413 1.1417 Columns 23 through 24 1.1419 1.1421

Columns 1 through 22 175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035 108.9705 78.4408 Columns 23 through 24 47.8409 17.1898

1.0e+03 * Columns 1 through 22 0.3115 0.5381 0.7029 0.8228 0.9100 0.9734 1.0196 1.0531 1.0775 1.0953 1.1082 1.1176 1.1245 1.1294 1.1330 1.1357 1.1376 1.1390 1.1400 1.1407 1.1413 1.1417 Columns 23 through 25 1.1419 1.1421 1.1423

Columns 1 through 22 175.4214 294.6306 372.9508 421.5283 448.4711 459.6766 459.4349 450.8663 436.2409 417.2097 394.9738 370.4066 344.1438 316.6475 288.2540 259.2079 229.6870 199.8209 169.7035 139.4035 108.9705 78.4408 Columns 23 through 25 47.8409 17.1898 -13.4986

figure

plot(x,y)

grid

xlabel('Traveled distance (m)')

ylabel('Altitude (m)')

The disp calls in the loop are not necessary. It would be beter to display the stored values after the loop finishes.

.

2 Comments
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Tomas White on 9 Feb 2022

Thank you for your time! I understood your explaination pretty clearly

Star Strider on 9 Feb 2022

As always, my pleasure!

Thank you!

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Answer 2

David Hill on 8 Feb 2022

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Direct link to this answer

https://www.mathworks.com/matlabcentral/answers/1645860-plot-function-only-plots-one-coordinate#answer_891620

fprintf('Parabolic motion 1\n');
fprintf(1,'Provide an input for the following constants\n');
V0 = input('Initial velocity = ');
b0 = input('Angle =  ');
C = input('"C" = Proyectile mass / air resistance coefficient =  ');
t = input('Number of desired plotted points =  ');
T=linspace(0,10,t);%how long do you want (I assumed 10 seconds)
vy = V0*cosd(b0);
vx = V0*sind(b0);
x= C * vx * (1-2.718.^(-(T)/C));
y= (C * vy + 9.8 * ((C)^2))*(1-2.718.^(-(T)/C))-9.8 * C * T;
plot(x,y);

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Plot function only plots one coordinate

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