Mixing
Trying to get function to iterate matrix
I am writing code to model a compression test. There are 211 xdata points and to make the formula work I need to calculate F at for each xdata point and use the value I1 for each iteration of F to put in the formula.
L is a value that varies from 1 to 0.8 depending on the xdata.
What I would like is to get a different value for I1 at each xdata point and then use that in the function.
This is working fine for L in the function, but I think because I1 is defined before the function starts there is an issue.
Any help would be greatly appreciated!
syms W1
syms W2
format long
format compact
data = xlsread('sample8.xlsx'); % two columns of data
xdata = data(:,1);
ydata = data(:,2);
Area = 133; % area of surface mm^2
Force = ydata; %mN
L = 1 - (xdata ./ 100); %Lambda
Lambda_inverse = L.^-1;
F = blkdiag(L.^-1, L.^-1, L.^2);
FT = F.';
B = F*FT;
I1 = trace(B);
fun = @(W,xdata) -Area.*( (W(1).* exp( (W(2)) .* (I1 - 3)) ) .* (L.^2 .* L.^-1) );
%starting guess
Wguess = [5,5];
[W,fminres] = lsqcurvefit(fun,Wguess,xdata,ydata)
matlab function matrix
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
add a comment |
I am writing code to model a compression test. There are 211 xdata points and to make the formula work I need to calculate F at for each xdata point and use the value I1 for each iteration of F to put in the formula.
L is a value that varies from 1 to 0.8 depending on the xdata.
What I would like is to get a different value for I1 at each xdata point and then use that in the function.
This is working fine for L in the function, but I think because I1 is defined before the function starts there is an issue.
Any help would be greatly appreciated!
syms W1
syms W2
format long
format compact
data = xlsread('sample8.xlsx'); % two columns of data
xdata = data(:,1);
ydata = data(:,2);
Area = 133; % area of surface mm^2
Force = ydata; %mN
L = 1 - (xdata ./ 100); %Lambda
Lambda_inverse = L.^-1;
F = blkdiag(L.^-1, L.^-1, L.^2);
FT = F.';
B = F*FT;
I1 = trace(B);
fun = @(W,xdata) -Area.*( (W(1).* exp( (W(2)) .* (I1 - 3)) ) .* (L.^2 .* L.^-1) );
%starting guess
Wguess = [5,5];
[W,fminres] = lsqcurvefit(fun,Wguess,xdata,ydata)
matlab function matrix
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48
add a comment |
I am writing code to model a compression test. There are 211 xdata points and to make the formula work I need to calculate F at for each xdata point and use the value I1 for each iteration of F to put in the formula.
L is a value that varies from 1 to 0.8 depending on the xdata.
What I would like is to get a different value for I1 at each xdata point and then use that in the function.
This is working fine for L in the function, but I think because I1 is defined before the function starts there is an issue.
Any help would be greatly appreciated!
syms W1
syms W2
format long
format compact
data = xlsread('sample8.xlsx'); % two columns of data
xdata = data(:,1);
ydata = data(:,2);
Area = 133; % area of surface mm^2
Force = ydata; %mN
L = 1 - (xdata ./ 100); %Lambda
Lambda_inverse = L.^-1;
F = blkdiag(L.^-1, L.^-1, L.^2);
FT = F.';
B = F*FT;
I1 = trace(B);
fun = @(W,xdata) -Area.*( (W(1).* exp( (W(2)) .* (I1 - 3)) ) .* (L.^2 .* L.^-1) );
%starting guess
Wguess = [5,5];
[W,fminres] = lsqcurvefit(fun,Wguess,xdata,ydata)
matlab function matrix
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
I am writing code to model a compression test. There are 211 xdata points and to make the formula work I need to calculate F at for each xdata point and use the value I1 for each iteration of F to put in the formula.
L is a value that varies from 1 to 0.8 depending on the xdata.
What I would like is to get a different value for I1 at each xdata point and then use that in the function.
This is working fine for L in the function, but I think because I1 is defined before the function starts there is an issue.
Any help would be greatly appreciated!
syms W1
syms W2
format long
format compact
data = xlsread('sample8.xlsx'); % two columns of data
xdata = data(:,1);
ydata = data(:,2);
Area = 133; % area of surface mm^2
Force = ydata; %mN
L = 1 - (xdata ./ 100); %Lambda
Lambda_inverse = L.^-1;
F = blkdiag(L.^-1, L.^-1, L.^2);
FT = F.';
B = F*FT;
I1 = trace(B);
fun = @(W,xdata) -Area.*( (W(1).* exp( (W(2)) .* (I1 - 3)) ) .* (L.^2 .* L.^-1) );
%starting guess
Wguess = [5,5];
[W,fminres] = lsqcurvefit(fun,Wguess,xdata,ydata)
matlab function matrix
matlab function matrix
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
edited Nov 21 '18 at 19:31
Wolfie
16.1k51744
16.1k51744
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
asked Nov 21 '18 at 18:56
James BlackwellJames Blackwell
96
96
The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48
add a comment |
The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48
The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48
The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48
add a comment |
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The issue is not clear. What formula are you trying to use? Does your code crash or produce incorrect output? If it crashes, at which line, with what message and what is the type & size of input variables to the faulty line? If the output is incorrect, up to what point can you track the various variables to be correct and from what point are they bad?
– Brice
Nov 22 '18 at 8:48