MATLAB 到 C++：編碼器：不一致的數組維度串聯

Question

改編此編碼器兼容解決方案中的代碼以讀取 csv 數據，我在 Matlab Coder 的運行時問題檢查期間遇到了以下問題：

Error using cat>>check_non_axis_size (line 283)
Dimensions of arrays being concatenated are not consistent.

Error in cat>>cat_impl (line 102)
check_non_axis_size(isempty, i, sizes{i}, varargin{:});

Error in cat (line 22)
result = cat_impl(@always_isempty_matrix, axis, varargin{:});

Error in readCsv (line 28)
coder.ceval('sscanf', [token, NULL], ['%lf', NULL], coder.wref(result(k)));

我的適應：

function result = readCsv(filepath, rows, columns)

NULL = char(0);
fid = fopen(filepath, 'r');
% read entire file into char array
remainder = fread(fid, '*char');

% preallocation for speedup
result = coder.nullcopy(zeros(columns,rows));
k = 1;
while ~isempty(remainder)

    % comma, newline 
    delimiters = [',', char(10)];

    % strtok ignores leading delimiter,
    % returns chars upto, but not including, 
    % the next delimiter
    [token,remainder] = strtok(remainder, delimiters);

    % string to double conversion
    % no need to worry about return type / order
    % since we only look at one token at a time
    if coder.target('MATLAB')
          result(k) = sscanf(token, '%f');
    else
        coder.ceval('sscanf', [token, NULL], ['%lf', NULL], coder.wref(result(k)));
    end
    k = k + 1;
end

% workaround for filling column-major but breaks on single-line csv
result = reshape(result,rows, [])';
disp(k)
fclose(fid);

.csv以防萬一是 200x51 矩陣

在 matlab 中測試：按預期工作 - .csv以 1:1 讀取，與csvread()

該錯誤在代碼生成期間彈出，據我所知，將sscanf的結果寫入預分配的result數組存在問題 - 但僅適用於 c 代碼。

附錄：只有整數值(1,1,1,...,0)的行工作正常，實際浮點數(6.7308,38.7101,...,40.5999,0)因上述錯誤而中斷。

Answer 1

remainder = fread(f, [1, Inf], '*char');

原來在這種情況下sizeA參數不是可選的