If your stack is big enough: Code: double x[100000]; If not you'll have to do it on the heap instead: Code: double *x=new double[100000]; //... delete[] x;
If you plan to use Dynamic Memory Allocation, (*) in C : Code: float *x; x = (float *)malloc(100000 * sizeof(float) ); ... free(x); (*) in C++ : Code: float *x; x = new float[100000]; //... delete [] x; But, if you have an ANSI/ISO C++ specific compiler, you can declare such an array, without using Dynamic Memory Allocation : Code: #include <vector> std::vector<float> x(100000);
I want to use this way of doing things, Saswath....now how do I couple it with my code? The code being..... Code: #include<stdio.h> #include<conio.h> void main() { clrscr(); int j=101,y=j-1,z,p; int k,m,l,i,g,n,q,a; int r,t; float s,sd1,avg; float mavg[1000],sds[1000],sds1[1000],sd[1000],A[]={126332363.4610 , 126332295.1810 , 126332226.8900 , 126332158.5990 , 126332090.3270 , 126332022.0410 , 126331953.7590 , 126331885.4740 , 126331817.1800 , 126331748.8930 , 126331680.6070 , 126331612.3320 , 126331544.0540 , 126331475.7560 , 126331407.4670 , 126331339.1870 , 126331270.9070 , 126331202.6230 , 126331134.3280 , 126331066.0420 , 126330997.7580 , 126330929.4790 , 126330861.1910 , 126330792.9020 ,126330724.6240 , 126330656.3540 , 126330588.0730 , 126330519.7710 , 126330451.4860 , 126330383.2070 ,126330314.9290 , 126330246.6370 , 126330178.3430 , 126330110.0730 , 126330041.7950 , 126329973.5100 , 126329905.2190 , 126329836.9300 , 126329768.6510 , 126329700.3780 , 126329632.0950 , 126329563.8050 , 126329495.5270 , 126329427.2490 , 126329358.9680 , 126329290.6790 , 126329222.3980 , 126329154.1150 , 126329085.8320 , 126329017.5450 , 126328949.2550 , 126328880.9730 , 126328812.6820 , 126328744.3870 , 126328676.1090 , 126328607.8390 , 126328539.5530 , 126328471.2570 , 126328402.9720 , 126328334.6880 ,126328266.4060 , 126328198.1180 , 126328129.8240 , 126328061.5460 , 126327993.2820 , 126327924.9980 , 126327856.7020 , 126327788.4220 , 126327720.1300 , 126327651.8550 , 126327583.5620 , 126327515.2700 , 126327446.9770 , 126327378.7020 , 126327310.4260 , 126327242.1450 , 126327173.8530 , 126327105.5730 , 126327037.2810 , 126326968.9940 , 126326900.7160 , 126326832.4360 , 126326764.1450 , 126326695.8530 , 126326627.5690 , 126326559.2960 , 126326491.0040 , 126326422.7150 , 126326354.4370 , 126326286.1590 ,126326217.8590 , 126326149.5700 , 126326081.2920 , 126326013.0010 , 126325944.7200 , 126325876.4330 , 126325808.1460 , 126325739.8540 , 126325671.5710 , 126325603.2760,126325534.9840 },dev[100],dev1[100],ma2[100]; printf("Enter number of the starting sample: "); scanf("%d",&r); printf("Enter number of the ending sample: "); scanf("%d",&t); for(a=0;a<t-r;a++,r++) { sd[a]=A[r]; } printf("Enter number of items to calculate the moving avg on the successive diff array:"); scanf("%u",&z); printf("Enter number of items to calculate the moving avg on the deviation array:"); scanf("%u",&p); printf("\n"); for(l=k=0;k<y,l<y;l++,k++) { sd1=sd[k+1]-sd[k]; sds[k]=sds1[l]=sd1; // printf("\n") ; // printf("\n sdiff%d is %f",k,sds[k]); } //printf("\n"); for(m=0;m<(y-(z-1));m++) { s=0; for(i=0;i<z;i++) { //printf("\nsds[%d]=%f ",i+m,sds1[i+m]); s=s+sds1[i+m]; //printf("\n%f",s); } avg=s/z; //printf("\navg for m=%d is %f",m,avg); mavg[m]=avg; printf("mavg[%d]is%f\n",m,mavg[m]); // printf("\n"); } printf("\n"); for(g=0,l=(((z+1)/2)-1);g<(y-z),l<(y+1-((z+1)/2));g++,l++) { dev[g]=dev1[g]= sds1[l]-mavg[g]; printf("dev[%d]=%f\n",g,dev[g]); } for(q=0;q<(g-p+1);q++) { s=0; for(n=0;n<p;n++) { s=s+dev[n+q]; // printf("\n%f",s); } avg=s/p; //printf("\navg for m=%d is %f",m,avg); ma2[q]=avg; printf("\n"); printf("ma2[%d]is%f",q,ma2[q]); // printf("\n"); } getch(); } Thanks!!
The array of interest is mavg[].....I need this to be very large...... Code: float mavg[1000] ,sds[1000],sds1[1000],sd[1000],A[]={126332363.4610 , 126332295.1810 , 126332226.8900 , 126332158.5990 , 126332090.3270 , 126332022.0410 , 126331953.7590 , 126331885.4740 , 126331817.1800 , 126331748.8930 , 126331680.6070 , 126331612.3320 , 126331544.0540 , 126331475.7560 , 126331407.4670 , 126331339.1870 , 126331270.9070 , 126331202.6230 , 126331134.3280 , 126331066.0420 , 126330997.7580 , 126330929.4790 , 126330861.1910 , 126330792.9020 ,126330724.6240 , 126330656.3540 , 126330588.0730 , 126330519.7710 , 126330451.4860 , 126330383.2070 ,126330314.9290 , 126330246.6370 , 126330178.3430 , 126330110.0730 , 126330041.7950 , 126329973.5100 , 126329905.2190 , 126329836.9300 , 126329768.6510 , 126329700.3780 , 126329632.0950 , 126329563.8050 , 126329495.5270 , 126329427.2490 , 126329358.9680 , 126329290.6790 , 126329222.3980 , 126329154.1150 , 126329085.8320 , 126329017.5450 , 126328949.2550 , 126328880.9730 , 126328812.6820 , 126328744.3870 , 126328676.1090 , 126328607.8390 , 126328539.5530 , 126328471.2570 , 126328402.9720 , 126328334.6880 ,126328266.4060 , 126328198.1180 , 126328129.8240 , 126328061.5460 , 126327993.2820 , 126327924.9980 , 126327856.7020 , 126327788.4220 , 126327720.1300 , 126327651.8550 , 126327583.5620 , 126327515.2700 , 126327446.9770 , 126327378.7020 , 126327310.4260 , 126327242.1450 , 126327173.8530 , 126327105.5730 , 126327037.2810 , 126326968.9940 , 126326900.7160 , 126326832.4360 , 126326764.1450 , 126326695.8530 , 126326627.5690 , 126326559.2960 , 126326491.0040 , 126326422.7150 , 126326354.4370 , 126326286.1590 ,126326217.8590 , 126326149.5700 , 126326081.2920 , 126326013.0010 , 126325944.7200 , 126325876.4330 , 126325808.1460 , 126325739.8540 , 126325671.5710 , 126325603.2760,126325534.9840 }
Just use the code Saswat gave you, so instead of Code: float mavg[1000], sds[1000] /* etc */ ; use this: Code: float *mavg, sds[1000] /* etc */ ; mavg=(float *)malloc(100000 * sizeof(float) ); // the rest of your code free(mavg); // don't forget this!
Ok..thanks..I am starting to get a hold of things here......once I allocate the memory...using DMA...How do I store values into the memory locations... e.g. I free memory using the following code......how do I store values into the locations pointed by pointer A. Code: #include<stdio.h> #include<conio.h> #include<stdlib.h> void main() { clrscr(); { double *A; A=(double *)malloc(100000000 * sizeof(double) ); if(A==NULL) { printf("unsuccessful"); // exit(0); } else { printf("you are in luck kid!!"); } free(A);} getch(); }
Same way you do it with normal arrays, e.g. A[5]=27; I would strongly advise you start reading a C book; it will tell you all this.
You are allocating space for 100000000 doubles, which is equivalent to 100000000 * 8 bytes = 781248 KBs = 762 MBs !! :surprised :crazy: :surprised If you don't have enough Virtual Memory (Page File Size), your system will crash ! See what happens in my task manager (running Windows XP) :: Initially :: Finally :: As expected
