Why is it giving me undefined function for the slope field?

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Natalie Haddadeen 2018-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/420403-why-is-it-giving-me-undefined-function-for-the-slope-field

编辑： David Goodmanson 2022-7-10

f=@(x,y)(exp(-x)-y)*(exp(-x)+2+y)
slopefield(f,[xmin,xmax],[-10,10],20)
hold on
drawode(f,[-10,10],2,3)
drawode(f,[-10,10],5,7)
hold off

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Jan 2022-7-9

@David Goodmanson: Breanda is not the OP.

Torsten 2022-7-9

编辑：Torsten 2022-7-9

在 MATLAB Online 中打开

@Brenda

The path given in

addpath('C:\Users\myname\Documents\MATLAB\myfunctions')

was just an example.

Once you find the file you search for, you must add the path to this file (i.e. your path) in the way as shown above.

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回答（1 个）

David Goodmanson 2022-7-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420403-why-is-it-giving-me-undefined-function-for-the-slope-field#answer_1003830

编辑：David Goodmanson 2022-7-10

在 MATLAB Online 中打开

Hello Brenda,

As an alternative to figuring out how to get that code up and running, or as a comparison, you can run your own code:

xmin = -3; xmax = 6, delx = .3;
ymin = -6; ymax = 6, dely = .3;
[x y]= meshgrid([xmin:delx:xmax],[ymin:dely:ymax])
f=@(x,y)(exp(-x)-y).*(exp(-x)+2+y);          % change  *  to   .*
th = atan(f(x,y));
linlen = .2;                                 % line lengths
u = linlen*cos(th);             
v = linlen*sin(th);
figure(1)
quiver(x,y,u,v,0,'showarrowhead',0)
grid on
axis equal
xlabel('x')
ylabel('y')