Recent content by ecastro

Hello, I haven't changed anything yet, the two snippets I have shown are part of the same algorithm, it just that "x" is being done in a function rather than in "main". However, I was successful in compiling the code in x64 and it's now working! :wink: But I would like to ask a few questions...

Thank you for these insights! Now that you mention it, the code does end when the memory reaches 2GB, so this might indeed be the problem and I need to compile it in x64 (which I still need to learn how; I'm still a novice in these kinds of things :-p) The "x" array is indeed deleted after I...

Thank you for all the replies! I have increased the heap reserve size to 50,000,000 and it still doesn't work. I counted the exact number of data points present through another program and it matches the number of data points that was stored in the vector, which I think means that allocating...

Sorry about this. Here is a snippet of the code. ifstream file; ofstream save_file1, save_file2; string file_name, line, file_cc, file_df; double J, min_J; int* c = nullptr; int* min_c = NULL; int data_point; int num_data = 0; double prog = 0...

I have written a C++ code in Visual Studio 2019 that requires an input tab-delimited text file and outputs a text file that is also tab-delimited. The data within the text file are stored in a vector and then it will perform calculations, whose results will then be written in a text file as...

Unfortunately, the problem still persists.

I have a .dat file which contains an ##m \times n## (specifically, a ##9 \times 2##) array and I have a file which has this kind of format, variable_x xx variable_y yy where xx and yy are numbers (I'll call this file the input_file). This file serves as an input to an external program, which I...

Thank you for your reply! Actually, I am trying to understand the SIFT algorithm and trying to write it in code; it interpolates the neighbourhood of a pixel using the first three terms of the Taylor series. I am pretty much interested in the local extremum point, but I was curious for the...

Thank you for the confirmation. I arrived at this solution, assuming that ##\left(a, b, c\right) = \left(0, 0, 0\right)## (for short-writing), \begin{align*} 0 &= \begin{bmatrix}\frac{\partial}{\partial x} \\ \frac{\partial}{\partial y} \\ \frac{\partial}{\partial z}\end{bmatrix} f\left(0, 0...

Firstly, the matrix notation of the series is, \begin{align*} f\left(x, y, z\right) &= f\left(a, b, c\right) + \left(\mathbf{x} - \mathbf{a}\right)^T \frac{\partial f\left(a, b, c\right)}{\partial \mathbf{x}} + \frac{1}{2}\left(\mathbf{x} - \mathbf{a}\right)^T \frac{\partial^2 f\left(a, b...

Is there any particular reason why we should flip signs? Oh, I never thought of this. Thanks!

Homework Statement If ##f\left(x\right) = x^2 + 2x + 2##, find two functions ##g## for which ##\left(f \circ g\right)\left(x\right) = x^2 - 4x + 5##. Homework Equations If ##f\left(x\right) = x^2 + 2x + 2##, then ##\left(f \circ g\right)\left(x\right) = g\left(x\right)^2 + 2g\left(x\right) +...

This is one of the confusions I had, so if I integrate along all directions of the incoming and reflected radiation, it is the albedo? Is this correct? If the Fresnel Coefficient "reflectivity" is indeed equal to the "reflectance" to what I had in mind before, does that mean that if I integrate...

I think this indeed the case, but I am more concerned about the general term "albedo", or does albedo is concerned with long wavelength radiation? Is there no such thing as an albedo for visible or ultraviolet radiation? I think what you are referring to as "reflectivity" is a coefficient from...

Thank you for your reply. I did read about the albedo being used in astronomical bodies, but I first encountered this term in a topic regarding the Earth's radiation budget, and on remote sensing. So I want to know its interpretation on terrestrial objects. As an addition, I have encountered...