Community Profile # Robert Demyanovich

Last seen: Today 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...

13 dagen ago | 1 answer | 0

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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...

14 dagen ago | 1 answer | 0

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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...

21 dagen ago | 1 answer | 0

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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...

22 dagen ago | 1 answer | 0

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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)...

28 dagen ago | 2 answers | 0

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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...

ongeveer een maand 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...

ongeveer een maand ago | 2 answers | 0

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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...

ongeveer een maand ago | 3 answers | 0

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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...

ongeveer 2 maanden ago | 1 answer | 0

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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...

ongeveer 2 maanden ago | 1 answer | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 2 answers | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 2 answers | 0

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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 maanden ago | 2 answers | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 2 answers | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 1 answer | 0

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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 maanden ago | 2 answers | 0

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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...

5 maanden ago | 1 answer | 0

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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 maanden ago | 2 answers | 0