MATLAB matrix using in function

I can't use matrix in my functions. Can you help me?

u=symunit;
M=7.75*u.cm
R=2.54*u.m
a_ef=10:10:100
deltap=-7.55*(M^2/R^2)*(1/(0.116+log(R/2.405*a_ef)))

Error using symengine

Invalid operands.

Error in sym/privBinaryOp (line 1034)

Csym = mupadmex(op,args{1}.s, args{2}.s, varargin{:});

Error in / (line 382)

X = privBinaryOp(A, B, 'symobj::mrdivide');

Answer 1

[Steven Lord]

Use element-wise division for the operations that will operate on the vector a_ef.

deltap=-7.55*(M^2/R^2)*(1./(0.116+log(R./2.405*a_ef)));

The first division, M^2/R^2, is dividing two scalars so ./ is not required (but it would work.)

[Mehmet SARIARSLAN]

Problem isn't solved.

u=symunit;
M=7.75*u.cm
R=2.54*u.m
a_ef=(10:10:100)*u.mm
deltap=-7.55*((M^2)/(R^2))*(1/(0.116+log((R)/2.405*a_ef)))

Error using symengine

Invalid operands.

Error in sym/privBinaryOp (line 1034)

Csym = mupadmex(op,args{1}.s, args{2}.s, varargin{:});

Error in / (line 382)

X = privBinaryOp(A, B, 'symobj::mrdivide');

[Steven Lord]

You did not replace / with ./ in the last line. When I do I can run it. If this resolves the problem please delete your flag and accept the answer. Thanks.

u=symunit;
M=7.75*u.cm;
R=2.54*u.m;
a_ef=(10:10:100)*u.mm;
deltap=-7.55*((M^2)/(R^2))*(1./(0.116+log((R)./2.405*a_ef)));
deltap(1)

ans = 

simplify(deltap(1))

ans = 

Answer 2

[Mehmet SARIARSLAN]

All my code

u=symunit;
M=7.75*u.cm
R=2.54*u.m
a_ef=(10:10:100)*u.mm
deltap=-7.55*((M^2)/(R^2))*(1/(0.116+log((R)/2.405*a_ef)))
%plot(deltap,a_ef)

M =

R =

a_ef =

Error using symengine

Invalid operands.

Error in sym/privBinaryOp (line 1034)

Csym = mupadmex(op,args{1}.s, args{2}.s, varargin{:});

Error in / (line 382)

X = privBinaryOp(A, B, 'symobj::mrdivide');