# Mr M.

Last seen: 3 years ago Active since 2014

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Question

How to fill end of rows of a matrix with NaN values?
I have a matrix M, and vector of indices K. I would like to make an element M(k,j) = NaN if j >= K(k). It is possible to do this...

3 years ago | 2 answers | 0

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Why find cannot handle this very simple task?
X = -0.1:.001:.25; find(X == .077) I get the following: ans = 1×0 empty double row vector However X(178) = 0.077. How to ge...

3 years ago | 2 answers | 0

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Question

Why linsolve cannot solve this very simple equation?
A = [4,2,2; 5,1,3; 6,0,4]; B = [60; 70; 80]; X = linsolve(A,B) The solution should be 6, 7, 11, since: 4x6 + 2x7 + 2x11 = 60...

3 years ago | 2 answers | 0

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Is it possible to determine within a function the location of that function?
Is it possible to determine the location (folder consisting that function) of a used function within the function? I dont want...

4 years ago | 1 answer | 0

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How to make raster circle with arbitrary high resolution?
Is it possible to plot a vectorized circle in MATLAB and save it to a pixelized raster figure with arbitrary high resolution? I...

5 years ago | 1 answer | 0

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How to plot a smooth color wheel?
How to plot a smooth color wheel, like this? https://color.adobe.com/create/color-wheel/

5 years ago | 1 answer | 0

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How to fit a line on the plane?
How to fit a line onto dots on the plane? polyfit is not the solution, because it is good for functions and not for points on th...

5 years ago | 1 answer | 0

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How to plot nice thick line segments?
My problem is that there is a little gap or ugly corners when I try to use thick line segments after each other, see the followi...

5 years ago | 0 answers | 0

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Question

How to count first identical elements without a for cycle?
I have a vector [3 3 3 3 3 4 1 1 0 0 0 5 6 3 3 1 1 1], and I want to count threes at the begining of the vector, so the result h...

5 years ago | 1 answer | 0

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Question

There is no solution for global optimum search in Optimization Toolbox?
I have to buy the Global Optimization Toolbox?

5 years ago | 2 answers | 0

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Question

How to count repetition of a row in a matrix?
I have a matrix: M = [1,2; 2,3; 1,5; 2,3; 1,4; 1,6; 2;3, 8,9]; And I want to check number of occurance of a given row, for examp...

5 years ago | 1 answer | 0

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Question

Is it possible, or is it used to, or is it elegant to change input variables?
Is it possible, or is it used to, or is it elegant to change input variables/parameters of a function inside the function?

5 years ago | 3 answers | 0

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Question

Is it possible to set all data(n).x = []; without a for cycle?
Is it possible to do the following withot a for cycle? for n = 1:N, data(n).x = []; end

5 years ago | 1 answer | 0

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Question

How to define an object witch has parameters and functions?
How to define an object witch has parameters and functions?

5 years ago | 0 answers | 0

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How to maximize a function if I have both integer and continuous variables?
How to maximize a function if I have both integer and continuous variables? What is the right syntax? I have to use constraints ...

5 years ago | 2 answers | 0

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Question

Is it possible to print color text in the command window?
Is it possible to print color text in the command window?

5 years ago | 1 answer | 2

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Question

Is it possible to write local function in a function?
Or this is possible only for scripts and not for functions?

5 years ago | 1 answer | 0

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Question

How to eval an expression without an error?
I would like to eval an expression, for example eval('x=a+b;'); But in case of non-existing a or b, I dont want to get an error,...

5 years ago | 2 answers | 0

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Question

How to copy a structure without a field?
I have p with field1, filed2, filed3 (p(1).field1, p(2).filed1, p(1).filed2, etc.). I want to make a copy: q = p, but copy only ...

5 years ago | 1 answer | 0

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Question

Is it possible to collect length of filed values without a for cycle?
Is it possible to fill the size vector fithout a for cycle? for i = 1:length(params) size(i) = length(params(i)....

5 years ago | 0 answers | 0

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Question

How to check the existance of a struct field at a given index?
p(1).name = 'name1'; p(1).value = 1:10; p(2).name = 'name2'; I want to check existance of p(2).value, but exist and empty is ...

5 years ago | 1 answer | 0

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Question

How to find a string in the following cell structure?
I have s{1}.name = 'abc', s{2}.name = 'xyz', ..., s{n}.name = 'something'. And I would like to know the existance of a strin mys...

5 years ago | 2 answers | 0

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Question

How to use scatter with transparent dots?
facealpha is not working for me

5 years ago | 1 answer | 1

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Question

Is it possible to use yticks only on one side?
Is it possible to use yticks only on one side? How to set?

5 years ago | 1 answer | 0

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Question

What is the simplest way to extract lengths of NaN sequences from a vector?
What is the simplest way to extract lengths of NaN sequences from a vector? Plus the indices of their locations!

5 years ago | 2 answers | 0

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Question

How to decrease line space between multiple lines in a title, tex or xlabel?
I know how to hack if I want to increase, but how to decrease?

5 years ago | 0 answers | 2

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How to catch warnings?
I want to catch Warning: Matrix is close to singular or badly scaled, during a matrix division A/B.

5 years ago | 2 answers | 3

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Question

How to create matrix of all combinations?
Suppose I have variables x1, x2, x3. x1 can be any element of the set {1,2,3}, x2 can be {1,2,3,4,5} and x3 can be {10,11,12,13,...

6 years ago | 2 answers | 0

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Question

Is it possible to use a function with 2 outputs and sometimes with 4 outputs?
And how to order the output variables? [x1,x2,x3,x4] = f(); or [x4,x3,x2,x1] = f();

6 years ago | 1 answer | 0