Please help me, I can not solve problem

clc
F=inline('X-e.^(-X.^2).*cos(X)'); % Function
X=1; % Starting Point
H=0.762; % Initial stepsize
EPS=0.0001; % Error Tolerance

%%PREPARE PLOT DATA
XP=X:H/100:X+7;YP=F(XP);  (LINE13)
XP1=XP(1);XP2=XP(length(XP));
plot(XP,YP) %FUNCTION PLOT
grid on
hold on
plot([XP1 XP2],[0 0],'r')%PLOT OF X AXIS
xlabel('X');
ylabel('F(X)')

Answer 1

[Star Strider]

I believe you intended the exponential function when you wrote e.^(). The correct function is exp. Also, inline functions are going to disappear in a future MATLAB release, so I would use the anonymous function version instead:

F = inline('X-exp(-X.^2).*cos(X)');     % Inline Function
F = @(X) X-exp(-X.^2).*cos(X);          % Anonymous Function

Your code works with these changes.

You can read more about anonymous functions by following the link in Function Basics.

[suleyman majidli]

Thanks, it really helped.I have another problem

clc F0=inline('sinh(X)-ln(X)'); % Function F1=inline('cosh(X)-1/X'); % Derivative of the Function X0=1.1645621; % Starting Point X=X0; H=0.762; % Initial stepsize ? EPS=0.0001; % Error Tolerance

%% PREPARE PLOT DATA XP=X:H/100:X+3;YP=F0(XP); XP1=XP(1);XP2=XP(length(XP)); plot(XP,YP) %FUNCTION PLOT

Error using inlineeval (line 15) Error in inline expression ==> sinh(X)-ln(X) Undefined function 'ln' for input arguments of type 'double'.

Error in inline/subsref (line 24) INLINE_OUT_ = inlineeval(INLINE_INPUTS_, INLINE_OBJ_.inputExpr, INLINE_OBJ_.expr);

Error in NewtonRaphson (line 12) XP=X:H/100:X+3;YP=F0(XP);

[Star Strider]

The natural logarithm in MATLAB is the log function.

Your ‘F0’ function should be:

F0 = @(X) sinh(X)-log(X);

[suleyman majidli]

thanks a lot : )

[Star Strider]

My pleasure.

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