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Robert Demyanovich


Last seen: 2 days ago Active since 2021

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Question


Scan a row and replace any values equal to zero
I need to replace any zero values in the columns of a specific row, i +1, of a matrix, cA, with a specific value, say 1E-07. How...

10 days ago | 1 answer | 0

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answer

Question


Sum of Least Squares
I have a table, Check, where I would like to subtract column 6 from column 5 (to obtain a residual) and then square the residual...

12 days ago | 1 answer | 0

1

answer

Question


Dimensions of arrays being concatenated are not consistent.
I have no idea why I am getting an error in the following code: FluorDataInd = round(i/TimeFactor)+1 x=[ConcValues{1,1} Co...

19 days ago | 1 answer | 0

1

answer

Question


Select a record from a table where an exact value is not provided
I have a table which I will be loading with Excel data (I haven't ever done that, but I think I can just paste data in). My que...

19 days ago | 1 answer | 0

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answer

Question


Initializing all rows with one set of values in one half and another set in the other half
The following line of code works for initializing the first row of an array: cA(1,:)=[cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)...

25 days ago | 2 answers | 0

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answers

Answered
Retrieve curve fit coefficients
I tried using coeffvalues, but all it does is store a bunch of text including the values that I want in a 1x1 something or other...

1 month ago | 0

Question


Retrieve curve fit coefficients
I am using a 4PL function written by someone and available from a MatLab search. I don't understand how to store the curve fitt...

1 month ago | 2 answers | 0

2

answers

Question


stop execution of code to check results
Is there a way to stop code from executing so that results can be checked. For example something like if i == 100000 Stop...

1 month ago | 3 answers | 0

3

answers

Question


Set upper and lower bounds of for loop
I would like to set the upper and lower bounds of a for loop based on the values of simulation parameters. I'm not sure how to...

2 months ago | 1 answer | 0

1

answer

Question


How to handle NAN when summing
I have the following code: for k = 1:N W(i,k)=W1*(cB(i,k))^W2; Fluor(i,k)= cB(i,k)*W(i,k)*dx; end FL = su...

2 months ago | 1 answer | 0

1

answer

Question


How to sum a portion of a row in a table and get a single value
How do I sum a portion of a row in a Matlab table and get a single value? For example assume that the row number is i and the c...

2 months ago | 1 answer | 0

1

answer

Question


if statement with greater than and less than
The following doesn't seem to be working as intended: if 0 <= MBPosition <= 2*Delta ; Even though MBPosition is within the ran...

4 months ago | 2 answers | 0

2

answers

Question


if statement for two arrays
I am programming a chemical reaction. I want to make sure that the amount of product produced does not exceed the amount of ava...

4 months ago | 1 answer | 0

1

answer

Question


Run "if" logic on a row
I have the following code for the reaction interface between acid and base (A-acid, B-base,S-salt): dS=k1*cA(i+1,:).*cB(i+1...

4 months ago | 1 answer | 0

1

answer

Question


Matlab less than comparison
The Matlab documentation is confusing me. I want to test each cell in a specific row of an array (cA). If that cell has a valu...

4 months ago | 2 answers | 0

2

answers

Question


Include value requirement in array multiplication
I currently have the following line of code: dS=k1*cA(i+1,:).*cB(i+1,:)*dt dS is the amount of product S resulting from a reac...

4 months ago | 2 answers | 0

2

answers

Question


if statement with ge and &
I don't understand why the following line is producing an error: if j ge 2 & cANALY(i+1,j-1) < 0 j is a scalar and cANALY(...

4 months ago | 1 answer | 0

1

answer

Question


"Highlight" a vertical gridline on a figure
I have a figure where the range of x values starts at a negative value and goes to a positive value. I would like to "highlight...

4 months ago | 1 answer | 0

1

answer

Question


set xticks by calculation but also force 0 to be displayed
I am setting xticks manually based on user inputs for distance. The plot will span the distance range; for example -1.3E-06 to ...

4 months ago | 2 answers | 0

2

answers

Question


string for figure title ignores text after variable
I have the following code while creating a figure: titlestr=sprintf('Time=%6.5f',t(1), 'sec'); title(titlestr); No error...

4 months ago | 1 answer | 0

1

answer

Question


min function on two arrays
I've read the documentation on the min function, but still don't understand how it works on two arrays. I have the following: ...

4 months ago | 1 answer | 0

1

answer

Question


Sum function on part of an array
I don't understand what the following sum function does. mA=zeros(M,1); mA(1)=sum(cA(1,:))*dx; mA is a column vector, s...

4 months ago | 1 answer | 0

1

answer

Question


Initializing 1/2 of a row with one value and the other half with another
I don't understand why the following works. It initializes row 1 of the array c with values of 1 in roughly the first half of t...

4 months ago | 2 answers | 0

2

answers

Question


Find the first element of a column in a matrix that has a value equal to zero
I have an m by n matrix and I'm interested in the nth column. Initially all of the values in the nth column are greater than ze...

4 months ago | 1 answer | 0

1

answer

Question


How to code an instantaneous reaction in Matlab
I have two slabs adjacent to one another. One contains acid and one contains base. The reaction at the interface in instantane...

5 months ago | 2 answers | 0

2

answers

Question


Can Matlab be used to solve a moving boundary problem
I'm trying to determine the neutralization time (tn) of strong acid and strong base. Strong acid, A, is initially in a slab of t...

5 months ago | 0 answers | 0

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answers