Desmos – How to Change Function Color Without Deleting

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I don't see any way to change the color of some function without the need to delete it and recreate it.

I think and believe that there must be a better, easier, faster and more convenient way to change the color of any function without the need to delete it and recreate it all the time but if there is better and easier way to do that then what is it?

Best Answer

From Change Color or Style (UNTESTED - I think you would need to be signed in, or click on Edit List (the gear icon) first):

To change the color or style of an expression, long-hold the colored icon to the left of the expression. Clicking the icon will hide or show the expression.

Related Solutions

Desmos – How to Solve ‘k’ Index Issue in Function Grapher

When Desmos looks at your third expression, it sees something like (ignoring a lot): sum of k inside a sum of k

Mathematically speaking, this would be bad notation, so Desmos throws an error. The developers put a lot of thought into balancing expectations of math teachers/students and programmers/computer scientists (c.f. Logs and Infinities), and I think they made the right call here.

You can make use of the total() function to get the result you want: total([1...n])

How to conveniently plot any implicit function in desmos without repetitions of code and typing

You can't do that because you're defining f(x,y) twice.

First let's understand the difference between 2 kinds of Desmos statements: Equations and Function Definitions.

These are all equations:

y = 1
y = x
y = x ^ 2 - x + 14
x ^ 2 + y ^ 2 = 1
x + y = 1
x / y = y / x
sin(x) = e^y

They're all relationships between x and y. Desmos can and will always plot equations as long as they only use x and y as variables.

These are function definitions:

f(x) = x
g(x) = x ^ 2 - 2 * x + 1
D(j) = j ^ j
C(y) = e ^ y
h(x, y) = x + y - x * y

They're like equations, but instead of typing y we give the equation a name, e.g. f(x) and then define it. The first 4 functions take one parameter, so they can be transformed to an equation and will be plotted:

f(x) = x                             //y = x
g(x) = x ^ 2 - 2 * x + 1             //y = x ^ 2 - 2 * x + 1
D(j) = j ^ j                         //y = x ^ x
C(y) = e ^ y                         //y = e ^ x

However the last one takes two parameters, so it can't be plotted on the plane.

Now back to the question, try doing this:

f(x, y) = 1
f(x, y) = x ^ 2 + y ^ 2
f(0, 0)

The last line will throw an error:

You've defined 'f' in more than one place. Try picking a different variable, or deleting some of the definitions of 'f'.

And that's exactly the issue, you defined the function f(x, y) in two spots, so Desmos can't tell which one to use to resolve your inquiry.

In the second example, you define f(x) once and g(x) once, and then you tell Desmos to plot the equation f(x) + g(x) which is basically y = f(x) + g(x) = x ^ 2 + x ^ 3.

Another thing is, your f(x, y) function takes two parameters so it'll never be plotted even if it was correctly defined once, because it's 3 dimensional but Desmos is in 2D.

For example:

f(x, y) = 3 x ^ 2 + x * y - 1

This function will be defined successfully without throwing, but won't be plotted because it's 3 dimensional. You can only plot one 2 dimensional 'slice' of it at a time:

g(x) = f(x,0)

This will plot.