{"record":{"id":"8aae2e4b4aff80b7","repo":"Yalantis/uCrop","slug":"cimg-appname-math-parser-cimg-s-s-s-types","errorCode":null,"errorMessage":"[cimg_appname_math_parser] CImg<%s>::%s: %s: Types of first and second arguments ('%s' and '%s') do not match with third argument 'nb_colsB=%u', in expression '%s'.","messagePattern":"\\[cimg_appname_math_parser\\] CImg<(.+?)>::(.+?): (.+?): Types of first and second arguments \\('(.+?)' and '(.+?)'\\) do not match with third argument 'nb_colsB=%u', in expression '(.+?)'\\.","errorType":"exception","errorClass":"CImgArgumentException","httpStatus":null,"severity":"error","filePath":"ucrop/src/main/jni/CImg.h","lineNumber":23485,"sourceCode":"              arg4 = 0;\n              if (s2<se1) {\n                s1 = ++s2; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;\n                arg3 = compile(s2,s1,depth1,0,block_flags);\n                arg4 = s1<se1?compile(++s1,se1,depth1,0,block_flags):0;\n              }\n              _cimg_mp_check_type(arg1,1,2,0);\n              _cimg_mp_check_type(arg2,2,2,0);\n              _cimg_mp_check_const_scalar(arg3,3,3);\n              _cimg_mp_check_type(arg4,4,1,0);\n\n              p1 = size(arg1);\n              p2 = size(arg2);\n              p3 = (unsigned int)mem[arg3];\n              arg5 = p2/p3;\n              arg6 = p1/arg5;\n              if (arg6*arg5!=p1 || arg5*p3!=p2) {\n                _cimg_mp_strerr;\n                throw CImgArgumentException(\"[\" cimg_appname \"_math_parser] \"\n                                            \"CImg<%s>::%s: %s: Types of first and second arguments ('%s' and '%s') \"\n                                            \"do not match with third argument 'nb_colsB=%u', \"\n                                            \"in expression '%s'.\",\n                                            pixel_type(),_cimg_mp_calling_function,s_op,\n                                            s_type(arg1)._data,s_type(arg2)._data,p3,s0);\n              }\n              pos = vector(arg6*p3);\n              CImg<ulongT>::vector((ulongT)mp_solve,pos,arg1,arg2,arg6,arg5,p3,arg4).move_to(code);\n              return_comp = true;\n              _cimg_mp_return(pos);\n            }\n\n            if (!std::strncmp(ss,\"sort(\",5)) { // Sort vector\n              _cimg_mp_op(\"Function 'sort()'\");\n              s1 = ss5; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;\n              arg1 = compile(ss5,s1,depth1,0,block_flags);\n              arg2 = arg4 = 1; arg3 = ~0U; arg5 = 0;\n              if (s1<se1) {","sourceCodeStart":23467,"sourceCodeEnd":23503,"githubUrl":"https://github.com/Yalantis/uCrop/blob/f788b534b48c144edf786c8cddbf0e029e637804/ucrop/src/main/jni/CImg.h#L23467-L23503","documentation":"For matrix-product-style opcodes taking (A,B,nb_colsB), the parser checks dimension consistency: size(B) must equal arg5*p3 and size(A) must be a multiple of arg5, where p3 is nb_colsB. If these products do not reconstruct the operand sizes, the operands are incompatible with the given nb_colsB and compilation fails.","triggerScenarios":"Calling a matrix-multiply-style opcode with vector A of size n1, vector B of size n2, and nb_colsB=c where n2 is not divisible by c, or the resulting shared dimension does not divide size(A).","commonSituations":"Passing flattened matrices whose column count changed; using nb_colsB from a different matrix; mixing row-major/column-major assumptions.","solutions":["Ensure size(B) is an exact multiple of nb_colsB (arg5 = size(B)/nb_colsB).","Ensure arg5 also divides size(A) with no remainder.","Recompute nb_colsB from the data instead of hard-coding it.","Flatten operands consistently (same layout) before the call."],"exampleFix":"// before: A size 6, B size 6, nb_colsB=4\n'mul(A,B,4)'\n// after\n'mul(A,B,2)' // arg5=3; 3*2=6 for both operands","handlingStrategy":"validation","validationCode":"const arg5 = Math.floor(b.length / nbColsB);\nif (arg5 * nbColsB !== b.length || a.length % arg5 !== 0) throw new Error('Operand sizes incompatible with nb_colsB');","typeGuard":null,"tryCatchPattern":"try { img.eval(expr); } catch (e) { if (/do not match with third argument 'nb_colsB/.test(e.message)) { /* recompute nb_colsB */ } else throw e; }","preventionTips":["Derive nb_colsB from b.length at expression-build time.","Keep flattened matrices row-major consistently.","Test matrix opcodes with synthetic vectors of known sizes."],"tags":["cimg","math-parser","matrix"],"backgroundTag":"tensor-shape-mismatch","analyzedSha":"f788b534b48c144edf786c8cddbf0e029e637804","analyzedAt":"2026-09-08T08:36:04.887Z","contentChangedAt":"2026-09-08T08:36:04.887Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}