Getting an error For colon operator with char operands, first and last operands must be char.

Im getting an error called "Error using : For colon operator with char operands, first and last operands must be char." I have the code that im trying to use for reference. I asked my professor about it and he doesnt have a solution for me and suggested me to talk to someone that might here.

[KSSV]

Show us the code which threw error. With out showing code how you expect us to help you?

[Stephen23]

The error message is easy to reproduce:

1:'a':100

Error using :
For colon operator with char operands, first and last operands must be char.

But because you do not explain anything about your code, we have no idea what you are trying to achieve or why.

[Joshua Meyer]

clear

clc

k=.0004

Re=2.*10.^6

F=@(f) -.86*ln((k./3.7)+(2.51./Re.*sqrt(f)))-sqrt(1/f)

j=('Input number of crossings =')

for i=1:j

f=input('the approxmate f where F is zero =')

fzero(F,f)

end

This is the code i have that results in the error

Answer 1

[Stephen23]

This line

j=('Input number of crossings =')

should be

j = input('number of crossings =')

[Joshua Meyer]

why doesnt it like this? my professor uses it and when i load his codes it works fine

clear
clc
clf
figure(1)
fplot(@(x) x.*exp(-x)-0.2,[0 8])
hold
fplot(@(y) y-y)
grid
F=@(x) x.*exp(-x)-0.2
n=input('the number of zero crossings   =')
for i=1:n
    x=input('the approxmate x where F is zero  =')
    fzero(F,x)
end
disp(' ')
disp(' ')
disp('PRESS ENTER TO CONTINUE')
pause

when i load this from a link and load it from matlab it runs fine

[Joshua Meyer]

OHHHHH i feel so dumb. thanks for the help. stupid simple mistakes changes everything

[Stephen23]

@Joshua Meyer: sometimes a second pair of eyes is handy :) Please remember to accept my answer!