How can i plot this function with factorial?

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James Daron
James Daron 2021-2-2
回答： Steven Lord 2021-2-2
I would like to have the following function plotting:
lap = (3*factorial(x)-1)./(120*10^(12));
xValues = linspace(0,1,20);
plot(xValues, semilap(xValues));
I get the following error message:
"Array indices must be positive integers or logical values."
I would also be very grateful if someone could tell me how to plot the Y-axis logarithmically in this case.
  1 个评论
VBBV
VBBV 2021-2-2
编辑：VBBV 2021-2-2
x = 4; % input vector same size as xValues
lap = (3*factorial(x)-1)./(120*10^(12));
xValues = linspace(0,1,20);
semilogy(xValues, (lap)); % semilogy
Value of x here is shown as e,g,

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回答（2 个）

Rik
Rik 2021-2-2
Ran in:
If you want to plot a function, you should do so explicitly:
lap = @(x)(3*factorial(x)-1)./(120*10^(12));
xValues = round(logspace(0,1,20));%round to make sure the input to factorial is interger-only
semilogy(xValues, lap(xValues))
Steven Lord
Steven Lord 2021-2-2
Ran in:
You haven't shown us what semilap is. If you intended for that to be the expression in lap evaluated at the points in xValues, you need to make lap a function or a function handle (which could be anonymous.) However:
lap = @(x) (3*factorial(x)-1)./(120*10^(12));
xValues = linspace(0,1,20);
plot(xValues, lap(xValues));
Error using factorial (line 20)
N must be an array of real non-negative integers.

Error in solution (line 1)
lap = @(x) (3*factorial(x)-1)./(120*10^(12));
the factorial function is only defined for real non-negative integer values and xValues contains non-integer values. You could use the gamma function instead.
As for plotting logarithmically, see the semilogy function (or semilogx if you want just the X axis to be in logarithmic scale or loglog if you want both logarithmic.)

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