Why is this error comming?

[John D'Errico]

As is too often the case, someone has posted a picture of their code. Now, for someone to test out what you did, we need to type in evertything, with no errors on our part. And that will take care and a fair amount of time.

Instead, you could have paste in your data directly, whcih would have taken fewer step on your part, and LESS time for you too. If you paste in text directly, then we can copy and paste it directly into MATLAB. ANd that would allow me to identify exactly what you did wrong in a few seconds.

So what you have done is to make it more difficult for someone to help you.

Is there a good reason why you want to make it more difficult to get help? Perhaps someone may bother to type in your code. Not me. Sorry.

[Deepak Singh]

okay.

Here's the code for it"-

clc;

clear;

carb = [80, 65, 30];

prot = [10, 12, 23];

fats = [32, 56, 42];

vit = [70, 37, 58];

carb_ex = 200;

prot_min = 175;

fats_max = 150;

A = [-prot fats];

b = [-prot_min, fats_max];

Aeq = carb;

beq = carb_ex;

lb = [0, 0, 0];

ub = [100, 100, 100];

x = linprog(-vit, A, b, Aeq, beq, lb, ub);

Answer 1

[Image Analyst]

We can't run an image. You should have posted your code as code.

It looks like A has 6 elements, whereas b has only 2 elements and needs 6.

[Deepak Singh]

Code:-

clc;
clear;
carb = [80, 65, 30];
prot = [10, 12, 23];
fats = [32, 56, 42];
vit = [70, 37, 58];
carb_ex = 200;
prot_min = 175;
fats_max = 150;
A = [-prot fats];
b = [-prot_min, fats_max];
Aeq = carb;
beq = carb_ex;
lb = [0, 0, 0];
ub = [100, 100, 100];
x = linprog(-vit, A, b, Aeq, beq, lb, ub);

[Deepak Singh]

Pls now check and please answer again.

[Deepak Singh]

Coud'nt understand this :- It looks like A has 6 elements, whereas b has only 2 elements and needs 6.

[Deepak Singh]

what to add

?

[Image Analyst]

Change this

b = [-prot_min, fats_max];

so it has 6 items. I don't know what order you want them since you didn't give the equation. Maybe it's

b = [-prot_min;-prot_min;-prot_min; fats_max;fats_max;fats_max];

but I really have no idea. Please give the equations you're trying to fit/model.

[Deepak Singh]

I tried you gave above but a new error came:-

Code:-

clc;
clear;
carb = [80, 65, 30];
prot = [10, 12, 23];
fats = [32, 56, 42];
vit = [70, 37, 58];
carb_ex = 200;
prot_min = 175;
fats_max = 150;
A = [-prot fats];
b = [-prot_min;-prot_min;-prot_min; fats_max;fats_max;fats_max];
Aeq = carb;
beq = carb_ex;
lb = [0, 0, 0];
ub = [100, 100, 100];
x = linprog(-vit, A, b, Aeq, beq, lb, ub);




Error:-
Error using linprog (line 253)
The number of rows in A must be the same as the number of elements of b.

Error in q2 (line 16)
x = linprog(-vit, A, b, Aeq, beq, lb, ub);




Note:- I coudn't enter and write error in new so wrote in this.
Pls understand.

I have sent you the question so i solved it using linprog and got error so aksed here.

as well as there is a error in last line pls check that also.

[Deepak Singh]

So as given i question we have to find hw much kilogram of each food item the person should consume so as to have maximum intake of vitamins by using any appropriate built in function present in matlab so i did with linprog and u can see the error.

[Image Analyst]

Looks like it expects A to have rows, more than 1. Right now it's a row vector with one row. You can change it into a column vector with 6 rows by doing

A = [-prot, fats]';

Using ' transposes the array changing it from a 6-column row vector into a 6-row column vector. Equivalent to

A = reshape(A, [], 1); % Make into a single column.

or

A = [-prot(:); fats(:)];