Unsual gradient from gradient

Hello, when I try and calculate the gradient I receive slope = gradient (fx)

slope =

(7167*x^2)/25000 - (3523*x)/5000 + 6389/10000

>>  GRAD = vpa  (slope, 10)

GRAD =

0.28668*x^2 - 0.7046*x + 0.6389

Will someone advised me how to interpret this please? GS.

Answer 1

[Star Strider]

The vpa function converts the fractions to their decimal equivalents (decimal fractions).

[Gavin Seddon]

Thank you, to get a single answer must this be calculated?

[Star Strider]

My pleasure.

Note that ‘GRAD’ is a function of ‘x’, so if you want a strictly numeric answer, you must provide a value for ‘x’.

[Gavin Seddon]

Hello, I followed the intuitive procedure however I received: x=10

x =

    10

>> solve slope Warning: Do not specify equations and variables as character vectors. Instead, create symbolic variables with syms. > In solve>getEqns (line 445) In solve (line 225)

ans =

0 thank you, will you direct me further please? GS.

[Star Strider]

My pleasure.

Your ‘slope’ expression needs to be defined as a function (available in R2012a and later).

syms x 
slope(x) = (7167*x^2)/25000 - (3523*x)/5000 + 6389/10000;
x = 10;
GRAD = vpa(slope(10))

GRAD =
22.2609

Ideally, the expression that created ‘slope’ should be defined as a function. Then ‘slope’ will inherit the function designation, and be a function itself.

[Gavin Seddon]

Hello and thank you.

[Gavin Seddon]

Hello and thank you.

[Star Strider]

As always, my pleasure.