how to write sqrtroot power 7 ?

Hi,

i m trying to write this function in MatLab g(x) = sqrt^7(14x-7) but i don t know how to write the power of a root.

I would love to learn how to do it,

thanks

Answer 1

[Dyuman Joshi]

Use power, .^ and define a Function Handle -

g = @(x) sqrt(14.*x - 7).^7

g = function_handle with value:
    @(x)sqrt(14.*x-7).^7

g(2)

ans = 4.2439e+04

g(1/2)

ans = 0

g([1/2 2])

ans = 1×2

1.0e+04 * 0 4.2439

I suggest you take the free MATLAB Onramp tutorial to learn the syntax and basics of MATLAB.

[Grégoire]

thanks !

[DGM]

You sure you're looking for

(14*x - 7)^(7/2)

instead of

(14*x - 7)^(1/7)

Answer 2

[Hassaan]

x = 2; % Example value for x

resultFromRootFunction = nthroot(14*x - 7, 7);
resultFromPowerFunction = (14*x - 7)^(1/7);

disp(['Using nthroot: ' num2str(resultFromRootFunction)]);

Using nthroot: 1.5449

disp(['Using power operator: ' num2str(resultFromPowerFunction)]);

Using power operator: 1.5449

MATLAB Basic Training:

To learn about MATLAB basic

MATLAB Onramp | Self-Paced Online Courses - MATLAB & Simulink (mathworks.com)

References:

Real nth root of real numbers - MATLAB nthroot (mathworks.com)

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Answer 3

[Sam Chak]

@Grégoire, If you mean this function:

then you can use the function handle:

g   = @(x) (sqrt(14*x - 7)).^7;
x   = 0.5:0.01:1;
plot(x, g(x)), grid on, xlabel x, ylabel g(x)