MATLAB: Plot always appears as a straight line

plot

v = [0:100];
m = 4.65*10.^-26;
y = ((m*v)/(4.14*10.^-21)).*exp((-m*v.^2)/2*4.14*10.^-21);
plot(v,y)
title('Density fucntion at t1 and t2')

Hi, I don't know how to fix this but my graph appears to be a straight line intead of an exponential curve. Thanks a lot!

Best Answer

Are you sure the second "4.14*10.^-21" doesn't belong in the denominator:

y = ((m*v)/(4.14*10.^-21)).*exp((-m*v.^2)/(2*4.14*10.^-21));

If so, and if you change the range of v to:

v = [0:1000];

you will get a nicely curved plot.

Related Solutions

MATLAB: I got error in the code “Powerflow Newton Raphson 2×2 matrix”. How to fixed it

You should never eval() a symbolic variable or expression: the language used for symbolic expressions is not exactly the same as MATLAB. You should use subs() if you want to bring in values for variables used in expressions.

You do not assign values to aY21 or aY22 but error is defined in terms of them. What do you expect it to mean to use >= to compare an expression with free variables to a specific numeric value to control the bounds of a while loop ?

In some contexts you can replace comparisons of symbolic expressions with piecewise(), but you would not do that as a bounds test for while -- you would not know whether the condition was satisfied until after you had left the loop for other reasons.

MATLAB: How can I plot graphs of function with various input arguments

Hi, use the below script to plot the graph. I think this is what you are looking for,

for v = 1:1200
    Y(v,1) = mfunction(v,0.032,8.31,300);
    X(v,1) = v;
end
plot(X,Y)

Best Answer

Related Solutions

MATLAB: I got error in the code “Powerflow Newton Raphson 2×2 matrix”. How to fixed it

MATLAB: How can I plot graphs of function with various input arguments

Related Question