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Help with csv data preparation
Hi! In your cell array the second and third entry of every line are numeric values already. You may split the string in the f...

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How can I delete certain rows of a matrix based on specific column values?
Hi! Suppose you have matrix M: % logical vector for rows to delete deleterow = false(size(M, 1), 1); % loop ov...

environ 12 ans il y a | 0

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Help in importing csv file
Hi! You may just load your file and process it afterwards like % load file fid = fopen('data.csv', 'r'); FC = ...

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Printing to specific lines in a text file
Hi! It is not difficult if the same columns are text and numbers. You can simply loop over all data and printf with "fprintf"...

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copy a line from a txt to other txt
Hi! count = 1; tline = fgetl(fid01); while ischar(tline) count = count + 1; disp(tline) if count == 3 fpr...

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Reshaping (M,N)-matrix to (M,1)-matrix
Hi! So your resulting matrix is a vector. right? Try this mat10 = ones(size(A, 1), 1) * 10.^((size(A, 2)-1):-1:0); ...

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OOP-Performance problems in accessing large arrays in class properties
To answer myself: It seems that this problem occurs only if the class is a handle class ...

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using checkboxes to select planets used in planetary motion code
Hi! Let's say you have 9 planets and 9 checkboxes. You need a logical vector of length 9. For each checkbox you define a call...

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how to model a collision between two particles?
Hi! If you already found a distance below some value, do you know both planets involved? If so you just add in your matrix bo...

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Question


OOP-Performance problems in accessing large arrays in class properties
Hi! I have a problem with accessing arrays that are properties of a class. I attached a sample class. In this class just one ...

plus de 12 ans il y a | 3 réponses | 2

3

réponses

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how to do it using matlab.
Hi! Trapeziod rule means you add both values on the right and left of your discretisation, multiply with the distance and tak...

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Pre-allocate memory gives zeros all the time, how to avoid?
Hi! Maybe your missing 10 because the first two rows are in the wrong order?

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how to do plotting with different colors in same figure?
Hi! If you plot like plot(x,y) and y is a matrix, you get plots with different color automatically. But you can do so...

plus de 12 ans il y a | 7

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how do i generate a 1X4 matrix with until the sum of the matrix =100
Hi! Another way may be to create 4 random numbers, take what is missing upto 100 and add to the numbers: % random nu...

plus de 12 ans il y a | 0

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Search a text in dat file
Hi! % read in file fid = fopen('filename.dat'); FC = textscan(fid, '%s', 'Delimiter', '\n'); fclose(fid); FC = ...

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Slicing tables into n columns and loops
Hi! Your data in an array is something like data = row(:, 2:end); You do not have to write the columns to separate va...

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How can I return a set of values in an array from a function file?
Hi! First you may create an empty array like yf = zeros(countmax, 1); This gives you an array of maximum size. In you...

plus de 12 ans il y a | 0

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Intersection points of multiply lines?
Hi! Take a look at the great pages of Paul Bourke: <http://paulbourke.net/>. You can find a matlab code for the distance of t...

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How to obtain code coverage
Hi! Do you know the profiler? This is what you need. Look in the documentation on how to profile a script/function. This give...

plus de 12 ans il y a | 1

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parsing integers from directory list
Hi! What du you have? An array of strings or a cell array? Are the numbers always in front of the file name? Suppose you h...

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How to test the times cost of each part in a program
Hi! Use the profiler, located under "Tools" in the menu bar.

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how to get rid of imaginary numbers, after a root.
Hi! What do you expect, physically? Your trajectory is a parabola with negative prefactor in front of t^2. So, the apex is th...

plus de 12 ans il y a | 0

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Help with textscan classifier
Hi! You can write C{1} = char(C{1}); This way you get a character array with each line corresponding to an atom type...

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read in only certain columns of big text file
Hi! I'll try an answer for my short example: 1 2 s 4 5 a 5 a 4 c d 6 f i 9 8 d g 10 i n (all tab separated!) ...

plus de 12 ans il y a | 0

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How do I write a for loop to calculate the difference between two points?
Hi! You store your entered user input in a matrix, say N. As you wrote N is of dimension n*2. The distance of a point from...

plus de 12 ans il y a | 0

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Write plot data in loop to file
Hi! Look at the commands fopen fprintf fclose to write to a file. You may use the open/close commands before/af...

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How to create a custom dynamic colormap?
Hi! You can use the command "colormap" to create color maps. The built-in colormaps can be scaled dynamically, like colo...

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How to from my vector coordinate to fit my meshgrid matrix?
Hi! Your looking for the "reshape" function to reshape your intensity "I": Imatrix = reshape(I, 25, 5)

plus de 12 ans il y a | 1

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Calling the same function from within the function??
Hi! For Fortran77 programs recursive functions (or subroutines) are not possible, as a standard compiler gives you a compile ...

plus de 12 ans il y a | 1

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matlab display string in multiple lines
strvcat({'shdujfhdkjshfkjsdhkjfhkjdshfkj', ... 'hsdkjfhkjsdhkjfhkjdshkfhskdhfk', ... 'shdkjfhskjfdhs'})

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