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# Nieves Lopez

Last seen: 6 months ago Active since 2015

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simplify function does not work properly
syms kd z mean_t mean_t2 p assume(assumptions(),'clear'); assume( 3*kd*mean_t2*mean_t^2 - 2*kd^2*mean_t2^2*mean_t + ... k...

6 months ago | 0

Question

simplify function does not work properly
Hello, I have an equation with 5 variables and a condition. Once I set the condition, when I simplify the equation, Matlab retu...

6 months ago | 3 answers | 0

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Question

Function solve cannot find explicit solution with 'ReturnConditions'=true but it finds when it is false
I have three equations, which depend on several variables. I need to find the solutions on the variables x, T and T0 (expressed ...

7 months ago | 1 answer | 0

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Question

How to find the roots of a sum of divisions of polynomials
How can I find those x values in which this function becomes f(x)=0? I have 4 vectors of length N: A, B, C, D, and f(x) = sum(...

3 years ago | 1 answer | 0

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Question

How can I efficiently select the best N items from a vector in different groups?
I need to select the best (weighted) items from several groups (days), like this days = [737399 737399 737399 737399 737400 737...

4 years ago | 0 answers | 0

### 0

Question

How can I efficiently (with no loops) compute the mean of each column in a matrix, taking different elements from each column?
I need to compute something similar to this: M = [ 1 2 3 4 5; ... 6 7 8 9 10; ... 11 12 13 14 15]; idx = [...

4 years ago | 2 answers | 0