Getting a ' Undefined function 'mtimes' for input arguments of type 'cells' ' error

Im completely new to matlab and I've got a problem that undoubtedly has a simple solution, but its beyond me at the moment, can anyone help?

• function [m, s1, s2] = Pop_up_test()
• answer = inputdlg({'mass', 'spring constant 1', 'spring constant 2'},'parameters',1);
• m = answer(1);
• disp(m);
• F = m * 9.8;
• disp(F)

I get the error in the 5th line where I calculate the force

Answer 1

[Mischa Kim]

Michael, use

 m = str2num(answer{1});

[Alagesan]

How to understand this arguments with simple coding??

see matrix W is the adjacency model

so that if you have n variables V={v1 ... vn} then: V=V*W

therefore:

v1={0 v2 v3 v4 ... vn} * W(:,1) which is the first column in W v2={v1 0 v3 v4 ... vn} * W(:,2) which is the second column in W ... vn={v1 v2 v3 v4 ... vn-1 0} * W(:,n) being the nth column in W

[KRUNAL]

I have my data as

filename is 'ofile.xlsx' that contains the following data :

 Year  Month  Day
 2014   06     11
 2014   05     10
 2014   07     15

I am trying to do this

......

....

 datecol1 = ofile(:,3)
 datecol2 = ofile(:,4)
 datecol3 = ofile(:,2)

 datecol = datecol1*1000000 + datecol2*10000 + datecol3;

 datestr(datecol,'mm/dd/yyyy')

But it does not give output as

 06/11/2014
 05/10/2014
 07/15/2014

Can you tell me what is wrong in this part of my code?