Error message says not enough input arguments

clear; clc; close all

W=input('Enter your wavelength in nanometers from 400nm to 700nm:\n');

if W>700 || W<400
fprintf(2,'Warning: Your input wavelength is not within the spectrum of visible light (400nm to 700nm).\n')
end

if W>400 && W<=450
    color=='violet';
elseif W>450 && W<=490
    color=='blue';
elseif W>490 && W<=560
    color=='green';
elseif W>560 && W<=590
    color=='yellow';
elseif W>590 && W<=635
    color=='orange';
elseif W>635 && W<700
     color=='red';
else 
    color=='not in the spectrum of visible light.'
end

fprintf('Your wavelength''s color is %s.\n',color)

so when input W=500, this is what comes out:

Error using color (line 19)
Not enough input arguments.

Help please!

Answer 1

[Wayne King]

You don't want color == , you want color =

W=input('Enter your wavelength in nanometers from 400nm to 700nm:\n');

if W>700 || W<400
fprintf(2,'Warning: Your input wavelength is not within the spectrum of visible light (400nm to 700nm).\n')
end

if W>400 && W<=450
    color='violet';
elseif W>450 && W<=490
    color='blue';
elseif W>490 && W<=560
    color='green';
elseif W>560 && W<=590
    color='yellow';
elseif W>590 && W<=635
    color='orange';
elseif W>635 && W<700
     color='red';
else 
    color='not in the spectrum of visible light.'
end

fprintf('Your wavelength''s color is %s.\n',color)