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Bob Nbob


356 total contributions since 2016

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Answered
overly convoluted elseif condition
You can replace all of them with a single statement and indexing. if x>=1 & x<=4 y = p(x); else y = 1; end

2 days ago | 0

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Answered
How to increment matrix row only inside a nested for loop?
The solution is indexing. You can do math in your index if you need to. x((i-1)*5+j) = i*j;

10 days ago | 0

Answered
filtering data with a for loop and plot only filtered data
This can be done much more simply with logic indexing. quer = meas.ay.data; quer = quer(quer > 1.5 | quer < -1.5); plot(quer)...

13 days ago | 1

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Answered
Replace values in collumns
You can just index your matrix to reorder it, assuming all of the columns are the same type of data (i.e. all of column 6 is z2,...

13 days ago | 0

Answered
2 variable for-loop
The issue is with your definition of test. Nested for loops are totally fine. test(:,ss)=TKE_dave(:,ss); On your last loop te...

13 days ago | 1

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Answered
Error Unable to perform assignment because dot indexing is not supported for variables of this type.
You are receiving the error because you have already defined the class of the first level as a character. In order to add a seco...

18 days ago | 0

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Answered
Changing Variable in matrix
Why are you originally defining A as A = [a b c]? This isn't very common or efficient matlab usage. I would suggest starting wit...

18 days ago | 0

Answered
Could someone please optimize this code?
I don't know about 'optimized,' but I'm pretty sure you can remove the entire for loop by vectorizing. Also, suppressing your va...

20 days ago | 0

Answered
How can I assign a variable to all the columns and all the rows of a matrix?
You don't need to actually create a new variable for this, you can just use the results from size. A = randi(100,20,10); [r,c]...

25 days ago | 0

Answered
A for loop with matrix as step
I'm confused what you're trying to do. From the psuedo code you wrote it looks like you're trying to loop through each of the a...

1 month ago | 0

Answered
Choose a cell array that satisfy better some criteria
Ok, here is what I have come up with. It will probably still need some tweaking, but you should be most interested in the calcul...

1 month ago | 0

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Answered
Is the find function a robust method to determine the number of specific values in a Matrix?
That method will certainly work, and I would generally use the same concept. I would just use the sum command though to avoid th...

1 month ago | 1

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Answered
can any one explain this line of the code.
Per matrix math rules, when you add a single value to a matrix, that operation is applied to all values of the matrix individual...

1 month ago | 0

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Answered
Find all the words contained in a file and make an index
You are on the right track, but you aren't calling the word index correctly. Also, I would suggest using strfind instead of the ...

2 months ago | 0

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Answered
Describing a sum with a while loop
I'm pretty sure that adding a big number to 0 will bump you over pi on the first iteration, but maybe that's just me. I would do...

2 months ago | 0

Answered
Select value from the list by defining criteria
I would use readtable to import the data, the logic indexing to narrow down the results. data = readtable('mydata.xlsx'); redu...

2 months ago | 0

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Answered
How to make matlab variables named as excel header
It sounds like readtable might be what you're looking for. I don't think it's exactly what you're asking, but it should recogniz...

2 months ago | 0

Answered
Matrix from an array
Not sure how to do it without a loop or just defining the indices, but here's something simple. A = 1:15; for i = 1:length(A)/...

2 months ago | 0

Answered
I want to circular shift rows of ' ww ' this circular shift depend on the numbers of 'r' array in the order , when the r numbers is change the circular shift is change for the ww array rows .
If I am understanding r correctly, you want to move the respective rows from their current positions to that position plus r(i)....

2 months ago | 1

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Answered
Extract Variable/column with variable name from table
I believe you can get this as a return. T.Properties.VariableNames % T is the table variable Additionally, because you're putt...

2 months ago | 0

Answered
My code is generating this error " Index exceeds matrix dimensions" . Apparently it looks fine. Still can not figure out the problem.
dfdc1(i,j) = (L/M) - M*(log(1 - c1(i,j) - c2(i,j)) - log(c1(i,j)))/M; c1 and c2 are defined as single values (0.1 and 0.0001), ...

2 months ago | 0

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Question


Extracting data from ascii file using regexp
I have an ascii file which produces the following text. 1 $FLAG1 NP1=8.,NP2=1.,P2=2.36,P3=3000000., 2 P1=0.,4....

2 months ago | 0 answers | 0

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answers

Answered
Create variable from an excel entry
Hmm, I normally wouldn't recommend anybody do this, and others might still disagree, but I think eval will do what you're lookin...

2 months ago | 0

Answered
Removing nested for loops for quicker time
I'm shooting in the dark a bit on this one, but I think you can get rid of both loops. The only thing I'm not entirely sure abou...

2 months ago | 0

Answered
Array indexing, matrix indexing
Personally, I don't think the loops are necessary. It's not much cleaner looking than the loops, but I suspect it will run more ...

2 months ago | 0

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Answered
picking up data file in each iteration
The best way I know how to do this is by listing all of the files using dir, and then looping through the files. flist = dir('*...

2 months ago | 1

Answered
Forloop taking too long to execute in code
Some things that I have noticed. [Dim1, Dim2, Dim3] = size(blind(1).VMPData); fmap = zeros(175, 121, 139); Might be smart to ...

2 months ago | 0

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Answered
How do I add text to the top of a CSV file?
The best way I have found to do this is with a combination of fprintf and dlmwrite. While csvwrite is nice for writing out the d...

2 months ago | 0

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Answered
Can somebody explain me this answer?
a=[1 2; 3 4]; % Dictates a matrix, 'a,' and it values. Is a 2x2 matrix a(3*ones(2)) % Calls the elements of 'a' which are locat...

2 months ago | 1

Answered
Finding the maximum output value and corrosponding input for a function
I'm going to make some assumptions with this answer, but I will try to explain them. The first assumption is that you know how ...

2 months ago | 0

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