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POc++ program for reading an unknown size csv file (filled only with floats) with constant (but unknown) number of columns into an array
 

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  1. POc++ program for reading an unknown size csv file (filled only with floats) with constant (but unknown) number of columns into an array
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    <p>was wondering if someone could give me a hand im trying to build a program that reads in a big data block of floats with unknown size from a csv file. I already wrote this in MATLAB but want to compile and distribute this so moving to c++.</p> <p>Im just learning and trying to read in this to start</p> <pre><code>7,5,1989 2,4,2312 </code></pre> <p>from a text file.</p> <p>code so far.</p> <pre><code>// Read in CSV // // Alex Byasse #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;vector&gt; #include &lt;string&gt; #include &lt;sstream&gt; #include &lt;stdlib.h&gt; int main() { unsigned int number_of_lines = 0; FILE *infile = fopen("textread.csv", "r"); int ch; int c = 0; bool tmp = true; while (EOF != (ch=getc(infile))){ if(',' == ch){ ++c; } if ('\n' == ch){ if (tmp){ int X = c; tmp = false; } ++number_of_lines; } } fclose(infile); std::ifstream file( "textread.csv" ); if(!file){ std:cerr &lt;&lt; "Failed to open File\n"; return 1; } const int ROWS = X; const int COLS = number_of_lines; const int BUFFSIZE = 100; int array[ROWS][COLS]; char buff[BUFFSIZE]; std::string line; int col = 0; int row = 0; while( std::getline( file, line ) ) { std::istringstream iss( line ); std::string result; while( std::getline( iss, result, ',' ) ) { array[row][col] = atoi( result.c_str() ); std::cout &lt;&lt; result &lt;&lt; std::endl; std::cout &lt;&lt; "column " &lt;&lt; col &lt;&lt; std::endl; std::cout &lt;&lt; "row " &lt;&lt; row &lt;&lt; std::endl; col = col+1; if (col == COLS){ std:cerr &lt;&lt; "Went over number of columns " &lt;&lt; COLS; } } row = row+1; if (row == ROWS){ std::cerr &lt;&lt; "Went over length of ROWS " &lt;&lt; ROWS; } col = 0; } return 0; } </code></pre> <p>My matlab code i use is >></p> <pre><code>fid = fopen(twoDM,'r'); s = textscan(fid,'%s','Delimiter','\n'); s = s{1}; s_e3t = s(strncmp('E3T',s,3)); s_e4q = s(strncmp('E4Q',s,3)); s_nd = s(strncmp('ND',s,2)); [~,cell_num_t,node1_t,node2_t,node3_t,mat] = strread([s_e3t{:}],'%s %u %u %u %u %u'); node4_t = node1_t; e3t = [node1_t,node2_t,node3_t,node4_t]; [~,cell_num_q,node1_q,node2_q,node3_q,node_4_q,~] = strread([s_e4q{:}],'%s %u %u %u %u %u %u'); e4q = [node1_q,node2_q,node3_q,node_4_q]; [~,~,node_X,node_Y,~] = strread([s_nd{:}],'%s %u %f %f %f'); cell_id = [cell_num_t;cell_num_q]; [~,i] = sort(cell_id,1,'ascend'); cell_node = [e3t;e4q]; cell_node = cell_node(i,:); </code></pre> <p>Any help appreciated. Alex</p>
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    1. USAndrew Barber
    1. USAlex Byasse
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      1. USMarc Claesen
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    1. COSo, do you actually have a question, or did you just want to show us your code?
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      1. USMats Petersson
    2. COuse g++ not gcc.
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      1. USAdam Burry
 

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